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Case Study and Passage Based Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations

• Last modified on: 6 months ago
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In CBSE Class 10 Science Paper, Students will have to answer some questions based on Assertion and Reason . There will be a few questions based on case studies and passage based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Here, we have provided case based/passage based questions for Class 10 Science Chapter 1 Chemical Reactions and Equations.

Table of Contents

Case Study/Passage Based Questions on Chemical Reactions and Equations

Case Study/Passage Based Questions

Question 1:

Corrosion is the phenomenon of deterioration of surface of metal in presence of air and moisture. It is a natural process and in the presence of a moist atmosphere, chemically active metals get corroded. This is an oxidation reaction. Rusting is the process where iron corrodes due to exposure to the atmosphere. The main circumstance of corrosion occurs with iron because it is a structural material in construction, bridges, buildings, rail transport, ships, etc. Aluminium is also an important structural metal, but even aluminium undergoes oxidation reactions. However, aluminium doesn’t corrode or oxidize as rapidly as its reactivity suggests. Copper (Cu) corrodes and forms a basic green carbonate.

(i) What is rusting?

(ii) Which two metals do not corrode easily?

(iii) Write the chemical name of the compound formed on corrosion of silver.

(iv) Corrosion is (a) a redox reaction (b) a reduction reaction (c) a displacement reaction (d) an oxidation reaction

Also read: Assertion Reason Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations

Question 2:

Oxidation is the process of gaining of oxygen, or losing of hydrogen. Reduction is the process of losing of oxygen or gaining of hydrogen. The substance which undergoes oxidation is the reducing agent while the substance which undergoes reduction is known as the oxidising agent. Oxidation and reduction always take place together and these type of reactions are known as redox reactions. Some of the examples of redox reactions are given below:

(i) Give two examples of oxidation reaction from your everyday life.

(ii) Write the oxidising agent in the reaction III and VI.

(iii) Which of the following is an oxidising agent? (a) LiAlH 4 (b) Alkaline KMnO 4 (c) Acidified K 2 Cr 2 O 7 (d) Both (b) and (c)

(iv) Out of oxidation and reduction, which reaction takes place at anode?

Also read: Extra Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations

Question 3:

A chemical reaction is a representation of chemical change in terms of symbols and formulae of reactants and products. There are various types of chemical reactions like combination, decomposition, displacement, double displacement, oxidation and reduction reactions. Reactions in which heat is released along with the formation of products are called exothermic chemical reactions. All combustion reactions are exothermic reactions.

(i) The chemical reaction in which a single substance breaks down into two or more simpler substances upon heating is known as (a) thermal decomposition reaction (b) photo decomposition reaction (c) electric decomposition reaction (d) both (a) and (c)

(ii) The massive force that pushes the rocket forward through space is generated due to the (a) combination reaction (b) decomposition reaction (c) displacement reaction (d) double displacement reaction

(iii) A white salt on heating decomposes to give brown fumes and yellow residue is left behind. The yellow residue left is of (a) lead nitrate (b) nitrogen oxide (c) lead oxide (d) oxygen gas

(iv) Which of the following reactions represents a combination reaction? (a) CaO (s) + H 2 O (l) → Ca(OH) 2 (aq) (b) CaCO 3 (s) → CaO (s) + CO 2 (g) (c) Zn(s) + CuSO 4 (aq) → ZnSO 4 (aq) + Cu(s) (d) 2FeSO 4 (s) → Fe 2 O 3 (s) +SO 2 (g) + SO 3 (g)

(v) Complete the following statements by choosing correct type of reaction for X and Y. Statement 1: The heating of lead nitrate is an example of ‘X’ reaction. Statement 2: The burning of magnesium is an example of ‘Y’ reaction. (a) X- Combination, Y- Decomposition (b) X- Decomposition, Y-Combination (c) X- Combination, Y-Displacement (d) X- Displacement, Y-Decomposition

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4 thoughts on “ Case Study and Passage Based Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations ”

Good examples! But can you please available practical types and equations type of case based questions which we can read and learn an then they help us to solve the Boards examm. Pleaseeww🙂🙂🙂

would love to see more equation based questions. nevertheless, it proved quite useful in my revision!

after going through the above content child should develops ideas to answer based on knowledge acquired.

• Pingback: Chemical Reactions and Equations Class 10 Case Study Questions Science Chapter 1 - XAM CONTENT

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CBSE 10th Standard Science Subject Chemical Reactions and Equations Chapter Case Study Questions With Solution 2021

By QB365 on 21 May, 2021

QB365 Provides the updated CASE Study Questions for Class 10 , and also provide the detail solution for each and every case study questions . Case study questions are latest updated question pattern from NCERT, QB365 will helps to get  more marks in Exams 

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Cbse 10th standard science subject chemical reactions and equations case study questions with solution 2021.

10th Standard CBSE

Final Semester - June 2015

Chemical equation is a method of representing a chemical reaction with the help of symbols and formulae of the substances involved in it. In a chemical equation, the substances which combine or react are called reactants and new substances produced are called products. A chemical equation is a short hand method of representing a chemical reaction. A balanced chemical equation has equal number of atoms of different elements in the reactants and products side. An unbalanced chemical equation has unequal number of atoms of one or more elements in reactants and products. Formulae of elements and compounds are not changed to balance an equation. (i) Consider the following reaction: pMg 3 N 2 + qH 2 O ⇾ rMg(OH) 2 + sNH 3 When the equation is balanced, the coefficients p, q, r, s respectively are

(ii) Which of the following information is not conveyed by a balanced chemical equation?

(iii) The balancing of chemical equations is in accordance with

(iv) Which of the following chemical equations is an unbalanced one?

(v) Which of the following statements is/are correct?

In decomposition reactions, a single reactant breaks down to form two or more products. A decomposition reaction is opposite to combination reaction. Thermal decomposition reactions use the energy in form of heat for the decomposition of reactants. Electrolytic decomposition reactions involve the use of electrical energy for the decomposition of reactant molecules. Photolysis or photochemical decomposition involves the use of light energy for the purpose of decomposition. (i) Which of the following reactions is a decomposition reaction?

\({ (ii) \ } 2 \mathrm{~Pb}\left(\mathrm{NO}_{3}\right)_{2} \longrightarrow 2 \mathrm{PbO}+n A+\mathrm{O}_{2}\) What is nA in the given reaction?

(iii) Amino acid is formed by the decomposition of which component of our diet?

(iv) Silver chloride on exposure to sunlight for a long duration turns grey due to (I) the formation of silver by decomposition of silver chloride (II) sublimation of silver chloride (III) decomposition of chlorine gas from silver chloride (IV) oxidation of silver chloride The correct statement(s) is/are

(v) What type of chemical reaction takes place when electricity is passed through water?

Redox reactions are those reactions in which oxidation and reduction occur Simultaneously. A redox reaction is made up of two half reactions. In the first half reaction, oxidation takes place and in second half reaction, reduction occurs. Oxidation is a process in which a substance loses electrons and in reduction, a substance gains electrons. The substance which gains electrons is reduced and acts as an oxidising agent. On the other hand, a substance which loses electrons is oxidised and acts as a reducing agent. (i) Which of the following is a redox reaction?

(ii) Identify the reaction in which H2 02 is acting as a reducing agent.

(iii) For the following reactions, identify the one in which H 2 S acts as a reducing agent.

(iv) For the following reaction, identify the correct statement. \(\mathrm{ZnO}+\mathrm{CO} \longrightarrow \mathrm{Zn}+\mathrm{CO}_{2}\)

(v) In the following reaction, which substance is reduced? \(\mathrm{PbS}+4 \mathrm{H}_{2} \mathrm{O}_{2} \longrightarrow \mathrm{PbSO}_{4}+4 \mathrm{H}_{2} \mathrm{O}\)

In a balanced chemical reaction, equal number of atoms are present on both sides of reaction. A balanced chemical reaction is based on law of conservation of mass which means that total mass of reactants and products participating in a reaction must be equal. For example, a balanced chemical equation of burning of magnesium in oxygen to form magnesium oxide is written as : \(2 \mathrm{Mg}+\mathrm{O}_{2} \longrightarrow 2 \mathrm{MgO}\) The mass of reactants (2 x 24 + 32 = 80) is equal to the mass of products [2 x (24 + 16) = 80] (i) In a reaction, 35 g of reactant, PQ breaks down into 20 g of product, P and an unknown amount of product, Q. Using the law of conservation of mass, weight of products, Q will be

(ii) When solid mercury (II) oxide is heated, liquid mercury and oxygen gas are produced. Which of the following statements is true regarding the balanced chemical equation for this process? (a) 1 mole of mercury (II) oxide produces two moles of mercury and one mole of oxygen gas (b) 2 moles of mercury (II) oxide produce one mole of mercury and one mole of oxygen gas (c) 1 mole of mercury (II) oxide produces half mole of mercury and half mole of oxygen gas (d) 2 moles of mercury (II) oxide produce 2 moles of mercury and one mole of oxygen gas (iii) Which of the following laws is satisfied by a balanced chemical equation?

(iv) In the given chemical reaction \(\mathrm{C}_{6} \mathrm{H}_{6(l)}+15 \mathrm{O}_{2(g)} \longrightarrow m \mathrm{CO}_{2(g)}+n \mathrm{H}_{2} \mathrm{O}_{(l)}\) The values of m and n are respectively

(v) Sulphur dioxide reacts with oxygen to form sulphur trioxide. What would be the molar ratio of sulphur dioxide to sulphur trioxide?

In a chemical reaction, reactants are converted into products. The conversion of reactants into products in a chemical reaction is often accompanied by some features which can be observed easily. These easily observed features which take place as a result of chemical reaction are known as characteristics of chemicals reactions. Some important characteristics of chemical reactions are:  (I) Evolution of heat  (II) Formation of precipitate (III) Change in colour (IV) Change in temperature (V) Change in state Anyone of these general characteristics can tell us whether a chemical reaction has taken place or not. (i) Reaction of magnesium with air is a/an

(ii) In the following reaction \(\mathrm{Ca}_{(a q)}^{2+}+2 \mathrm{OH}_{(a q)}^{-} \longrightarrow \mathrm{Ca}(\mathrm{OH})_{2(s)}\) precipitate of calcium hydroxide will be of

(iii) In the given reaction, \(\mathrm{S}_{(s)}+\mathrm{O}_{2(g)} \longrightarrow \mathrm{SO}_{2}\) the physical state of SO 2 is

(iv) Which one of the following processes involve chemical reactions?

(v) In which of the following reactions, high amount of heat energy will be evolved?

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Cbse 10th standard science subject chemical reactions and equations case study questions with solution 2021 answer keys.

\({ (i) }(\mathrm{b}): \mathrm{Mg}_{3} \mathrm{~N}_{2}+6 \mathrm{H}_{2} \mathrm{O} \longrightarrow 3 \mathrm{Mg}(\mathrm{OH})_{2}+2 \mathrm{NH}_{3}\) (ii) (d) (iii) (c): In a balanced chemical equation, total mass of reactants must be equal to the total mass of products. This is the statement of law of conservation of mass. (iv) (b) (v) (d)

(i) (c) \({ (ii) \ }(b): \ 2 \mathrm{~Pb}\left(\mathrm{NO}_{3}\right)_{2} \longrightarrow 2 \mathrm{PbO}+4 \mathrm{NO}_{2}+\mathrm{O}_{2}\) (iii) (c) : Proteins in our diet get broken down into amino acids. \({ (iv) }(\mathrm{a}): 2 \mathrm{AgCl}_{(\mathbf{s})} \stackrel{\text { Sunlight }}{\longrightarrow} 2 \mathrm{Ag}_{(s)}+\mathrm{Cl}_{2(g)}\) (v) (b): Electrolysis of water is electrolytic decomposition. \(\mathrm{H}_{2} \mathrm{O} \stackrel{\text { Current }}{\longrightarrow} 2 \mathrm{H}_{2}+\mathrm{O}_{2}\)

(I) (b) : H 2 is oxidised to HCI while Cl 2 is reduced to HCl. (ii) (c) \((iii) (c): 2 \mathrm{Fe} \mathrm{Cl}_{3}+\mathrm{H}_{2} \mathrm{~S} \longrightarrow 2 \mathrm{FeCl}_{2}+2 \mathrm{HCl}+\mathrm{s}\) H 2 Sitself gets oxidised to Sand reduces FeCl 3 to FeCI 2 (iv) (a ): ZnO is reduced to Zn and CO is oxidised to CO 2 (v) (b) : H 2 O 2 is reduced to water by removal of oxygen.

\(\text { (i) }(\mathbf{d}): P Q \longrightarrow P+Q\)                 \(35 \mathrm{~g} \quad \ \ \ 20 \mathrm{~g}+\text { ? }\) According to law of conservation of mass, Mass of PQ = Mass of P + Mass of Q   \(\therefore\)  Mass of Q = (35 - 20)g = 15 g \({ (ii) \ }(\mathbf{d}): 2 \mathrm{HgO}_{(s)} \longrightarrow 2 \mathrm{Hg}_{(l)}+\mathrm{O}_{2(g)}\) (iii) (b) (iv) (b) (v) (b)

(i) (a) (ii) (d) : Calcium hydroxide is a white colour solid. (iii) (c) : SO 2 is gaseous in nature. (iv) (d) : When copper is heated in the presence of air in a very high temperature, a chemical reaction takes place. Copper reacts with oxygen of the air to form a thin layer of copper oxide on the surface of metallic copper (v) (c) : On burning of L.P.G., heat is evolved.

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Case Study Questions Class 10 Science Chemical Reactions and Equations

Case study questions class 10 science chapter 1 chemical reactions and equations.

At Case Study Questions there will given a Paragraph. In where some Important Questions will made on that respective Case Based Study. There will various types of marks will given 1 marks, 2 marks, 3 marks, 4 marks.

CBSE Case Study Questions Class 10 Science Chemical Reactions and Equations

Case study 1.

A solution of slaked lime produced by the reaction is used for white washing walls. Calcium hydroxide reacts slowly with the carbon dioxide in air to form a thin layer of calcium carbonate on the walls. Calcium carbonate is formed after two to three days of white washing and gives a shiny finish to the walls. It is interesting to note that the chemical formula for marble is also CaCO3.

On the basis of above paragraph answer the following questions:

1.) Give the reaction for the formation of calcium carbonate with physical states.

 Ca(OH) 2 (s) + CO 2 (g) → CaCO 3 (s)↓ + H 2 O(l)

2.) Write the formulas of slaked lime, quick lime.

 Slaked lime: Calcium hydroxide is called as slaked lime with a formula of : Ca(OH)2  ,whereas calcium oxide is called as quick lime with a formula of : Ca0.

3.) Explain why calcium carbonate is used for white washing and not any other substance.

 Calcium carbonate is used for whitewashing as it produces a shiny film whilst the production of carbon dioxide and act as hard coating for the walls.

4.) Explain the importance of writing the physical states in a chemical equation.

 In any chemical reaction, physical states mention the nature of the reaction and their practical aspects which are necessary for lab uses.Physical states also explains whether reaction is exothermic or endothermic.

5.) Write any one application of calcium carbonate other than white washing.

Calcium carbonate is also used in the production of antacids and can also be used to increase the levels of calcium in body.

CASE STUDY : 2

You must have observed that iron articles are shiny when new, but get coated with a reddish brown powder when left for some time. This process is commonly known as rusting of iron. Some other metals also get tarnished in this manner. Have you noticed the colour of the coating formed on copper and silver? When a metal is attacked by substances around it such as moisture, acids, etc., it is said to corrode and this process is called corrosion. The black coating on silver and the green coating on copper are other examples of corrosion.

1.) Explain one benefit of corrosion.

Ans. Corrosion occurring in red blood cells of iron makes the colour of cells red which is highly useful in transportation of oxygen.

2.) Write the formula of corrosion of iron.

Ans. The general formula of corrosion of iron is Fe2 O3.

3.) If corrosion occurs in the case of iron articles, why is the iron pillar at Qutub Minar not effected?

Ans. The iron pillar at Qutub Minar is an ancient piece of metal knowledge in which the metal is very very pure( wrought iron) with low sulphur content and high phosphorus making it resistive to the outer environment.

4.) Write any two ways to prevent rusting.

Ans. The two ways to prevent rusting are:

A) Galvanization.

B) Painting of iron articles.

5.) What doe you mean by galvanization?

Ans. Galvanization is the process of applying a protective layer of Zn coating on materials which are prone to rust making it resistive and long lasting.

CASE STUDY : 3

When fats and oils are oxidized, they become rancid and their smell and taste change. Usually substances which prevent oxidation (antioxidants) are added to foods containing fats and oil. Keeping food in air tight containers helps to slow down oxidation.

1.) What do you mean by the word RANCIDITY?

Ans. The spoiling of food due to oxidation of fats and oils present in the food material

2.) Write any three methods to prevent rancidity.

Ans. Three methods to prevent rancidity of food includes:

B) Adding preservatives like vinegar

C) Storing in air tight containers.

3.) What is the meaning of antioxidants. Give an example.

Ans. The type of substances which can prevent the oxidation process of certain food materials are called as antioxidants. Some natural antioxidants are vitamin ­c, selenium etc.

4.) Which gas is filled in the chips packets to keep them crunchy?

Ans. The gas filled in chips packets is nitrogen gas which can keep the chips crunchy.

5.) Write any traditional method used by our ancestors to prevent rancidity.

Ans. There are a few methods used by our ancestors to prevent rancidity:

B) Sugaring

C) Pickling

CASE STUDY : 4

We have seen that the decomposition reactions require energy either in the form of heat, light or electricity for breaking down the reactants. Reactions in which energy is absorbed are known as endothermic reactions.

1.) Write the definition of exothermic reaction.

Ans. Reactions in which heat is evolved during the process are called as exothermic reactions, such as mixing of calcium oxide with water.

2.) What do you mean endothermic reactions?

Ans. Reactions in which heat is trapped or absorbed are called as endothermic reactions, such as glucose mixed with water.

3.) Write a reaction which falls under endothermic reaction.

Ans. Melting of ice, evaporation are considered under endothermic reactions. A chemical equation for these types of reaction is:

N2  + O2  + heat → 2 NO

4.) What is decomposition reaction?

Ans. Reactions in which a substance or reactant fragments to give one or many products.

5.) Explain photolysis.

Ans. Reactions in which reactant id decomposed with the help os sunlight are called as photolytic decomposition.

Ex: 2AgCl + sunlight → 2Ag + Cl2

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Case Based Questions for Ch 1 Chemical Reactions and Equations Class 10 Science

(i) The massive force that pushes the rocket forward through space is generated due to the

(a) combination reaction

(b) decomposition reaction

(c) displacement reaction

(d) double displacement reaction

(ii) A white salt on heating decomposes to give brown fumes and yellow residue is left behind. The yellow residue left is of

(a) lead nitrate

(b) nitrogen oxide

(c) lead oxide

(d) oxygen gas

(iii) Which of the following reactions represents a combination reaction?

(a) CaO (s) + H 2 O (l) ⟶ Ca(OH) 2  (aq)

(b) CaCO 3  (s) ⟶ CaO (s) + CO 2 (g)

(c) Zn(s) + CuSO 4  (aq) ⟶ ZnSO 4  (aq) + Cu(s)

(d) 2FeSO 4 (s) ⟶ Fe 2 O 3  (s) + SO 2 (g) + SO 3 (g)

(iv) Complete the following statements by choosing correct type of reaction for X and Y.

Statement 1: The heating of lead nitrate is an example of ‘X’ reaction.

Statement 2: The burning of magnesium is an example of ‘Y’ reaction.

(a) X-Combination, Y-Decomposition

(b) X-Decomposition, Y-Combination

(c) X-Combination, Y-Displacement

(d) X- Displacement, Y-Decomposition

Lead nitrate decomposes to give lead oxide and nitrogen oxide. Thus, X is a decomposition reaction.

2Pb(NO 3 ) 2 (s) ⟶ 2PbO(s) + 4NO 2 (g)

Magnesium burns in the presence of oxygen gas to magnesium oxide. Thus, Y is a combination reaction.

2Mg + O 2  ⟶ 2MgO

(b) combustion

(c) decomposition reaction

(d) photosynthesis

(ii) Which of the following is essential for photosynthesis?

(a) Sunlight

(b) Chlorophyll

(c) Glucose

(d) Both 'a' and 'b’

(iii) When a chemical compound decomposes on absorbing light and energy, then the reaction which takes place is known as:

(a) photosynthesis

(b) photodecomposition

(c) combination

(d) thermal decomposition

(iv) Which of the following reactions is an example of combustion reaction?

(a) C(s) + O 2 (g) ⟶ CO 2 (g)

(b) Zn(s) + H 2 SO 4 (aq) ⟶ ZnSO 4  + H 2 (g)

(c) Zn(s) +2HCl(aq) ⟶ ZnCl 2 (aq) + H 2 (g)

(d) 3Mg(s) + N 2 (g) ⟶ Mg 3 N 2 (s)

(v) Which of the following is an example of combination reaction?

(a) H 2  + Cl 2  ⟶ 2HCl

(b) Fe + S ⟶ FeS

(c) 2H 2  + O 2  ⟶ 2H 2 O

(d) All of them

Photosynthesis is the process by which green plants and some other organisms use sunlight to synthesis nutrients from carbon dioxide and water.

(iii) (b) photodecomposition

A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat.

(v) (d) All of them

The values of x and y are:

(a) 3 and 5

(b) 8 and 6

(c) 4 and 2

(d) 7 and 1

(ii) What happens when copper rod is dipped in iron sulphate solution:

(a) Copper displaces iron

(b) Blue colour of copper sulphate solution is obtained

(c) No reaction takes place

(d) Reaction is exothermic

(iii) A substance which oxidised itself and reduces other is known as:

(a) Oxidising agent

(b) Reducing agent

(c) Both (a) and (b)

(d) None of these

(iv) Fe 2 O 3  + 2Al ⟶ Al 2 O 3  + 2Fe

The above reaction is an example of a:

(a) Combination reaction

(b) Double displacement reaction

(c) Decomposition reaction

(d) Displacement reaction

(v) Name the products formed when iron filings are heated with dilute hydrochloric acid.

(a) Fe (III) chloride and water

(b) Fe (II) chloride and water

(c) Fe (II) chloride and hydrogen gas

(d) Fe (III) chloride and hydrogen gas

After balancing the equation, we get

Cu + 4HNO 3  ⟶ Cu(NO 3 ) 2  + 2NO 2  + 2H 2 O

(ii) (c) No reaction takes place.

(iii) (b) Reducing agent

Reducing agents reduce the other substance and in turn, get oxidized.

(iv) (d) Displacement reaction

(v) (c) Fe (II) chloride and hydrogen gas

When dilute Hydrochloric acid is added to iron filings, iron chloride & hydrogen gas is produced.

Fe + 2HCl ⟶ FeCl 2  + H 2

The iron displaces hydrogen from hydrochloric acid to form iron (II) chloride & hydrogen gas. This is a single displacement reaction.

(a) bleaching agent in the textile, paper and jute industry

(b) disinfectant for water to make water free of germs

(c) oxidising agent in many industries

(d) all of these

(ii) Bleaching powder is also known as:

(a) calcium oxychloride

(b) calcium hypochlorite

(c) chloride of lime

(iii) Bleaching powder gives smell of chlorine because it:

(a) is unstable

(b) gives chlorine on exposure to atmosphere

(c) is a mixture of chlorine and slaked lime

(d) contains excess of chlorine.

(iv) Select the correct statement(s) regarding bleaching powder.

(a) It is pale yellow powder having smell of chlorine.

(b) It is sparingly soluble in water and gives milky suspension when dissolved in water.

(c) As bleaching powder gives nascent oxygen, it shows bleaching property.

(d) All of these.

(v) Identify the product ‘X’ in the given reaction.

Ca(OH) 2  + Cl 2  ⟶ X + H 2 O

(a) CaOCl 2

(c) Ca(ClO 3 ) 2

Bleaching powder gives chlorine on exposure to air by reacting with CO 2 .

CaOCl 2  + CO 2  ⟶ CaCO 3  + Cl 2

Ca(OH) 2  + Cl 2  ⟶ CaOCl 2  + H 2 O

CaOCl 2 : calcium oxychloride (bleaching powder)

(i) Rancidity can be prevented by:

(a) adding antioxidants

(b) packaging oily food in nitrogen gas

(c) both (a) and (b)

(d) none of these.

(ii) Combination of phosphorus and oxygen is an example of:

(a) oxidation

(b) reduction

(c) rancidity

(d) none of these

(iii) A science teacher wrote the following statements about rancidity:

(I) When fats and oils are reduced, they become rancid.

(II) In chips packet, rancidity is prevented by oxygen.

(III) Rancidity is prevented by adding antioxidants.

Select the correct option

(a) (I) only

(b) (II) and (III) only

(c) (III) only

(d) (I), (II) and (III)

(iv) Two statements are given below regarding rusting of iron.

(I) The rusting of iron is a redox reaction and reaction occurs as,

4Fe + 3O 2 ⟶ 4Fe 3+ + 6O 2–

(II) The metallic iron is oxidised to Fe 2+ and O 2 is reduced to O 2– .

Select the correct statement(s).

(b) II only

(c) Both I and II

(v) Which of the following measures can be adopted to prevent or slow down rancidity?

(I) Food materials should be packed in air tight container.

(II) Food should be refrigerated.

(III)Food materials and cooked food should be kept away from direct sunlight.

(a) Only II and III

(b) Only I and III

(c) Only II and III

(d) I, II and III

Antioxidants and nitrogen gas prevent oxidation of food.

(ii) (a) oxidation

4P + 3O 2 ⟶ 2P 2 O 3 ,

4P + 5O 2 ⟶ 2P 2 O 5

(iii) (III) only

The oils and fats are slowly oxidised to certain bad smelling compounds, which release foul smell. This is known as rancidity. Rancidity is prevented by filling nitrogen gas in chips packets.

(iv) (a) I only

(v) (d) I, II and III

(i) Consider the following reaction:

pMg 3 N 2 + qH 2 O ⟶ rMg(OH) 2 + sNH 3

When the equation is balanced, the coefficients p, q, r, s respectively are:

(a) 1, 3, 3, 2

(b) 1, 6, 3, 2

(c) 1, 2, 3, 2

(d) 2, 3, 6, 2

(ii) Which of the following information is not conveyed by a balanced chemical equation?

(a) Physical states of reactants and products

(b) Symbols and formulae of all the substances involved in a particular reaction

(c) Number of atoms/molecules of the reactants and products formed

(d) Whether a particular reaction is actually feasible or not

(iii) The balancing of chemical equations is in accordance with

(a) law of combining volumes

(b) law of constant proportions

(c) law of conservation of mass

(d) both (b) and (c)

(iv) Which of the following chemical equations is an unbalanced one?

(a) 2NaHCO 3 ⟶ Na 2 CO 3 + H 2 O + CO 2

(b) 2C 4 H 10 + 12O 2 ⟶ 8CO 2 + 10H 2 O

(c) 2Al + 6H 2 O ⟶ 2Al(OH) 3 + 3H 2

(d) 4NH 3 + 5O 2 ⟶ 4NO + 6H 2 O

(v) Which of the following statements is/are correct?

(a) A chemical equation tells us about the substances involved in a reaction.

(b) A chemical equation informs us about the symbols and formulae of the substances involved in a reaction.

(c) A chemical equation tells us about the atoms or molecules of the reactants and products involved in a reaction.

(d) All the above.

(i) (b) 1, 6, 3, 2

Mg 3 N 2 + 6H 2 O ⟶ 3Mg(OH) 2 + 2NH 3

(ii) (d) Whether a particular reaction is actually feasible or not

(iii) (c) law of conservation of mass

In a balanced chemical equation, total mass of reactants must be equal to the total mass of products. This is the statement of law of conservation of mass.

(iv) (b) 2C 4 H 10 + 12O 2 ⟶ 8CO 2 + 10H 2 O

(v) (d) All the above.

(i) Which of the following is a redox reaction?

(a) CaCO 3 ⟶ CaO + CO 2

(b) H 2 + Cl 2 ⟶ 2HCl

(c) CaO + 2HCl ⟶ CaCl 2 + H 2 O

(d) NaOH + HCl ⟶ NaCl + H 2 O

(ii) Identify the reaction in which H2O2 is acting as a reducing agent.

(a) H 2 SO 3 + H 2 O 2 ⟶ H 2 SO 4 + H 2 O

(b) 2HI + H 2 O 2 ⟶ 2H 2 O + I 2

(c) Cl 2 + H 2 O 2 ⟶ 2HCl + O 2

(d) 2FeCl 2 + 2HCl + H 2 O 2 ⟶ 2FeCl 3 + 2H 2 O

(iii) For the following reactions, identify the one in which H2S acts as a reducing agent.

(a) CuSO 4 + H 2 S ⟶ CuS + H 2 SO 4

(b) Cd(NO 3 ) 2 + H 2 S ⟶ CdS + 2HNO 3

(c) 2FeCl 3 + H 2 S ⟶ 2FeCl 2 + 2HCl + S

(iv) For the following reaction, identify the correct statement.

ZnO + CO ⟶ Zn + CO 2

(a) ZnO is being reduced.

(b) CO 2 is being oxidised.

(c) CO is being reduced.

(d) ZnO is being oxidised.

(v) In the following reaction, which substance is reduced?

Pbs + 4H 2 O 2 ⟶ PbSO 4 + 4H 2 O

(b) H 2 O 2

(i) (b) H 2  + Cl 2  ⟶ 2HCl

H 2 is oxidised to HCl while Cl 2 is reduced to HCl.

(ii) (c) Cl 2 + H 2 O 2 ⟶ 2HCl + O 2

(iii) (c) 2FeCl 3 + H 2 S ⟶ 2FeCl 2 + 2HCl + S

H 2 S itself gets oxidised to S and reduces FeCl 3 to FeCl 2 .

(iv) (a) ZnO is being reduced. ZnO is reduced to Zn and CO is oxidised to CO 2 .

(v) (b) H 2 O 2 is reduced to water by removal of oxygen.

In a chemical reaction, reactants are converted into products. The conversion of reactants into products in a chemical reaction is often accompanied by some features which can be observed easily. These easily observed features which take place as a result of chemical reaction are known as characteristics of chemicals reactions. Some important characteristics of chemical reactions are:

(I) Evolution of heat

(II) Formation of precipitate

(III) Change in colour

(IV) Change in temperature

(V) Change in state

Any one of these general characteristics can tell us whether a chemical reaction has taken place or not.

(i) Reaction of magnesium with air is a/an:

(a) exothermic reaction

(b) endothermic reaction

(c) reversible reaction

(d) substitution reaction

(ii) In the following reaction,

Ca 2+ (aq) + 2OH - (aq) ⟶ Ca(OH) 2 (s)

precipitate of calcium hydroxide will be of:

(a) green colour

(b) blue colour

(c) brown colour

(d) white colour.

(iii) In the given reaction,

S(s) + O 2 (g) ⟶ SO 2

the physical state of SO 2 is

(c) gaseous

(d) all three.

(iv) Which one of the following processes involve chemical reactions?

(a) Storing of oxygen gas under pressure in a gas cylinder.

(b) Keeping petrol in a china dish in the open.

(c) Liquefaction of air.

(d) Heating copper wire in the presence of air at high temperature.

(v) In which of the following reactions, high amount of heat energy will be evolved?

(a) Electrolysis of water

(b) Dissolution of NH 4 Cl in water

(c) Burning of L.P.G.

(d) Decomposition of AgBr in the presence of light.

(i) (a) exothermic reaction

(ii) (d) white colour.

Calcium hydroxide is a white colour solid.

(iii) (c) gaseous

SO 2 is gaseous in nature.

(iv) (d) Heating copper wire in the presence of air at high temperature.

When copper is heated in the presence of air in a very high temperature, a chemical reaction takes place. Copper reacts with oxygen of the air to form a thin layer of copper oxide on the surface of metallic copper.

(v) (c) Burning of L.P.G.

On burning of L.P.G., heat is evolved.

(i) Copper displaces which of the following metals from its salt solution?

(ii) When zinc reacts with dilute sulphuric acid, the gas evolved is

(a) red in colour and have a sweet smelling.

(b) green in colour and have a foul smell.

(c) colourless, odourless and burns with a pop sound.

(d) colourless, pungent smelling and burns with a pop sound.

(iii) When dry hydrogen is passed over a heated oxide of metal X using the apparatus shown below, a reddish-brown residue is obtained.

The reddish-brown residue could be

(iv) Which of the following reactions is a displacement reaction?

(a) CaO + H 2 O ⟶ Ca(OH) 2

(c) Mg + CuSO 4 ⟶ MgSO 4 + Cu

(b) MgCO 3 ⟶ Mg + CO 2

(d) H 2 + Cl 2 ⟶ 2HCl

(v) When dilute hydrochloric acid is added to granulated zinc placed in a test tube, the observation made is

(a) the surface of the metal turns shining

(b) the reaction mixture turns milky

(c) greenish yellow gas is evolved

(d) the colourless and odourless gas evolves burns with a pop sound.

(i) (c) AgNO 3

Cu + 2AgNO 3 ⟶ Cu(NO 3 ) 2 + 2Ag

Copper can displace silver from its salt solution since, copper is more reactive than silver.

(ii) (c) colourless, odourless and burns with a pop sound.

Zn + H 2 SO 4 (dil.) ⟶ ZnSO 4 + H 2 ↑

H 2 is a colourless, odourless gas and burns with a pop sound.

(iii) (a) Copper is the reddish-brown residue as shown in below reaction.

(iv) (c) Mg + CuSO 4 ⟶ MgSO 4 + Cu

It is a single displacement reaction.

(v) (d) the colourless and odourless gas evolves burns with a pop sound.

Hydrogen gas is evolved in this reaction as shown in the reaction.

Zn + 2HCl ⟶ ZnCl 2 + H 2 ↑

Hydrogen gas is colourless and odourless which burns with a pop sound.

Those reactions in which two compounds react by an exchange of ions to form two new compounds are called double displacement reactions. A double displacement reaction usually occurs in solution and one of the products, being insoluble, precipitate out (separates as a solid). Any reaction in which an insoluble solid (called precipitate) is formed that separates from the solution is called a precipitation reaction. The reaction in which acid or acidic oxide reacts with base or basic oxide to form salt and water is called neutralisation reaction.

For example, 2NaOH + H 2 SO 4 ⟶ Na 2 SO 4 + H 2 O

(i) When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of a:

(b) displacement reaction

(ii) Which of the following is not a double displacement reaction?

(a) AgNO 3 (aq) + NaCl(aq) ⟶ AgCl(s) + NaNO 3 (aq)

(b) Zn(s) + H 2 SO 4 (aq) ⟶ ZnSO 4 (aq) + H 2 (g)

(c) CuSO 4 (aq) + H 2 S (aq) ⟶ CuS(s) + H 2 SO 4 (aq)

(d) Pb(NO 3 ) 2 (aq) + 2KI (aq) ⟶ PbI 2 (s) + 2KNO 3 (aq)

(iii) Barium chloride on reaction with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?

(I) Displacement reaction

(II) Precipitation reaction

(III) Combination reaction

(IV) Double displacement reaction

(b) (II) only

(c) (III) and (IV) only

(d) (II) and (IV) only

(iv) Identify A in the following reaction.

AlCl 3 (aq) + 3NH 4 OH(aq) ⟶ A + 3NH 4 Cl(aq)

(a) Al(OH) 3

(b) Al 2 O 3

(v) Consider the following reaction,

BaCl 2 + Na 2 SO 4 ⟶ BaSO 4 + 2NaCl

Identify the precipitate in the reaction.

(c) Na 2 SO 4

(i) (d) double displacement reaction

CuSO 4 + H 2 S ⟶ CuS + H 2 SO 4

Both CuSO 4 and H 2 S exchange their ions to give new compounds- CuS and H 2 SO 4 . Hence, this is a double displacement reaction.

(ii) (b) Zn(s) + H 2 SO 4 (aq) ⟶ ZnSO 4 (aq) + H 2 (g)

It is an example of single displacement reaction.

(iii) (d) (II) and (IV) only

BaCl 2 + (NH 4 ) 2 SO 4 ⟶ BaSO 4 ↓ + 2NH 4 Cl

(BaSO 4 : white ppt.)

It is a precipitation reaction as well as double displacement reaction.

(iv) (a) Al(OH) 3

AlCl 3 + 3NH 4 OH ⟶ Al(OH) 3 + 3NH 4 Cl

(v) (b) BaSO 4

BaCl 2 (aq) + Na 2 SO 4 (aq) ⟶ BaSO 4 (s) ↓ + 2NaCl(aq)

(i) A redox reaction is one in which:

(a) both the substances are reduced

(b) both the substances are oxidized

(c) an acid is neutralised by the base

(d) one substance is oxidised while the other is reduced.

(ii) In the reaction, H 2 S + Cl 2 ⟶ S + 2HCI

(a) H 2 S is the reducing agent.

(c) H 2 S is the oxidising agent.

(b) HCl is the oxidising agent.

(d) Cl 2 is the reducing agent.

(iii) Which of the following processes does not involve either oxidation or reduction?

(a) Formation of slaked lime from quick lime.

(b) Heating mercuric oxide.

(c) Formation of manganese chloride from manganese oxide (MnO 2 ).

(d) Formation of zinc from zinc blend.

(iv) Mg + CuO ⟶ MgO + Cu

Which of the following is wrong relating to the above reaction?

(a) CuO gets reduced.

(b) Mg gets oxidised.

(c) CuO gets oxidised.

(d) It is a redox reaction.

(v) Identify the correct oxidising agent and reducing agent in the following reaction.

Fe 2 O 3 + 2AI ⟶ 2Fe + Al 2 O 3

(a) Al - Oxidising agent, Fe 2 O 3 - Reducing agent

(b) Fe 2 O 3 - Oxidising agent, Al - Reducing agent

(c) Fe - Oxidising agent, Al 2 O 3 - Reducing agent

(b) Fe 2 O 3 - Oxidising agent, Al 2 O 3 - Reducing agent

(i) (d) one substance is oxidised while the other is reduced.

In a redox reaction, one reactant is reduced while other reactant is oxidised.

(ii) (a) H 2 S is the reducing agent.

(iii) (a) Formation of slaked lime from quick lime

It is a decomposition reaction.

(iv) (c) CuO gets oxidised.

Addition of oxygen is called oxidation while the removal of oxygen is called reduction.

Thus, Mg gets oxidised and CuO gets reduced and it is a redox reaction.

NCERT Solutions for Chapter 4 The Age of Industrialisation Class 10 History

Related chapters.

• Acids, Bases and Salts
• Metals and Non-metals
• Carbon and its Compounds
• Periodic Classification of Elements (Not in Syllabus)

Related Questions

• NCERT Solutions for Chapter 1 Chemical Reactions and Equations Class 10 Science
• NCERT Revision Notes for Chapter 1 Chemical Reactions and Equations Class 10 Science
• VSAQ for Ch 1 Chemical Reactions and Equations Class 10 Science NCERT
• Assertion and Reason for Ch 1 Chemical Reactions and Equations Class 10 Science

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Case Study Questions Class 10 Science Chapter 1 Chemical Reactions and Equations

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CBSE Board Exam is on the way, so you must practice some good Case Studies and Passage Based Questions of Class 10 Science to boost your preparation to score 95+% on Boards. In this post, you will get Case Study and Passage Based Questions that will come in CBSE Class 10 Science Board Exams. These Case Study Questions Class 10 Science are written by experts.

Join our Telegram Channel, there you will get various e-books for CBSE 2024 Boards exams for Class 9th, 10th, 11th, and 12th.

In CBSE Class 10 Science Paper, Students will have to answer some questions based on  Assertion and Reason . There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Chemical Reactions and Equations Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 10 Science  Chapter 1 Chemical Reactions and Equations

Case Study/Passage-Based Questions

Question 1:

A chemical reaction is a representation of chemical change in terms of symbols and formulae of reactants and products. There are various types of chemical reactions like combination, decomposition, displacement, double displacement, oxidation, and reduction reactions. Reactions in which heat is released along with the formation of products are called exothermic chemical reactions. All combustion reactions are exothermic reactions.

(i) The chemical reaction in which a single substance breaks down into two or simpler substances upon heating is known as (a) thermal decomposition reaction (b) photodecomposition reaction (c) electric decomposition reaction (d) both (a) and (c)

Answer: (a) The chemical reaction in which a single substance breaks down into two or more simpler substances upon heating is known as thermal decomposition reaction.

(ii) The massive force that pushes the rocket forward through space is generated due to the (a) combination reaction (b) decomposition reaction (c) displacement reaction (d) double displacement reaction

Answer: (b) The massive force that pushes the rocket forward through space is generated due to the decomposition reaction. Hydrogen peroxide decomposes and provides it with a considerable reaction force thrust.

(iii) A white salt on heating decomposes to give brown fumes and the yellow residue is left behind. The yellow residue left is of (a) lead nitrate (b) nitrogen oxide (c) lead oxide (d) oxygen gas

Answer: (c) Lead nitrate decomposes to give brown fumes of nitrogen dioxide gas and yellow residue of lead oxide is left behind.

(iv) Which of the following reactions represents a combination reaction? (a) CaO (s) + H 2 O (l) → Ca(OH) 2  (aq) (b) CaCO 3  (s) → CaO (s) + CO 2 (g) (c) Zn(s) + CuSO 4  (aq) → ZnSO 4  (aq) + Cu(s) (d) 2FeSO 4 (s) → Fe 2 O 3  (s) +SO 2 (g) + SO 3 (g)

Answer: (a) A reaction in which two or more reactants combine to form a single product is known as a combination reaction.

(v) Complete the following statements by choosing correct type of reaction for X and Y. Statement 1:  The heating of lead nitrate is an example of ‘X’ reaction. Statement 2:  The burning of magnesium is an example of ‘Y’ reaction. (a) X- Combination, Y- Decomposition (b) X- Decomposition, Y-Combination (c) X- Combination, Y-Displacement (d) X- Displacement, Y-Decomposition

Answer: (b) Heating of lead nitrate to form nitrogen dioxide and lead oxide is an example of thermal decomposition reaction and the burning of magnesium ribbon in the air to form magnesium oxide is an example of combination reaction.

Question 2:

In a chemical reaction, reactants are converted into products. The conversion of reactants into products in a chemical reaction is often accompanied by some features which can be observed easily. These easily observed features which take place as a result of chemical reactions are known as characteristics of chemical reactions. Some important characteristics of chemical reactions are:  (I) Evolution of heat  (II) Formation of a precipitate (III) Change in color (IV) Change in temperature (V) Change in state

Anyone of these general characteristics can tell us whether a chemical reaction has taken place or not.

(i) Reaction of magnesium with air is a/an

Answer: (a) exothermic reaction

(ii) In the following reaction Ca 2+ (aq)+2OH−(aq)⟶Ca(OH) 2 (s)Ca(aq) 2 ++2OH(aq)−⟶Ca(OH) 2 (s) precipitate of calcium hydroxide will be of

Answer: (d) white colour

(iii) In the given reaction, S(s)+O 2 (g)⟶SO 2 S(s)+O 2 (g)⟶SO 2 the physical state of SO 2  is

Answer: (c) gaseous 

(iv) Which one of the following processes involves chemical reactions?

Answer: (d) Heating copper wire in the presence of air at high temperature.

(v) In which of the following reactions, high amount of heat energy will be evolved?

Answer: (c) Burning of L.P.G.

Case Study 3: Chemical reactions and equations are fundamental concepts in chemistry that help us understand the transformation of substances. A chemical reaction involves the rearrangement of atoms to form new substances with different properties. In a chemical equation, the reactants are written on the left side, and the products are written on the right side, separated by an arrow. The number of atoms of each element must be balanced on both sides of the equation. This is achieved by using coefficients to adjust the number of molecules involved in the reaction. Chemical reactions can be classified into various types, such as combination reactions, decomposition reactions, displacement reactions, and redox reactions. Understanding and balancing chemical equations is crucial for studying chemical reactions, predicting the products formed, and analyzing the stoichiometry of reactions.

What do chemical reactions involve? a) Formation of new substances with different properties b) Rearrangement of atoms c) Balancing of equations d) All of the above Answer: d) All of the above

How are reactants and products represented in a chemical equation? a) Reactants on the left side, products on the right side b) Reactants on the right side, products on the left side c) Reactants and products mixed together d) Reactants and products in different equations Answer: a) Reactants on the left side, products on the right side

What must be balanced in a chemical equation? a) Number of molecules b) Number of atoms of each element c) Physical properties of substances d) Coefficients Answer: b) Number of atoms of each element

Which type of chemical reaction involves the breakdown of a compound into simpler substances? a) Combination reaction b) Decomposition reaction c) Displacement reaction d) Redox reaction Answer: b) Decomposition reaction

Why is balancing chemical equations important? a) To predict the products formed in a reaction b) To analyze the stoichiometry of reactions c) To study chemical reactions d) All of the above Answer: d) All of the above

Hope the information shed above regarding Case Study and Passage Based Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations with Answers Pdf free download has been useful to an extent. If you have any other queries about CBSE Class 10 Science Chemical Reactions and Equations Case Study and Passage Based Questions with Answers, feel free to comment below so that we can revert back to us at the earliest possible. By Team Study Rate

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• CBSE Class 10

CBSE Class 10 Science Chapter Wise Important Case Study Questions

Chapter wise important case study questions cbse class 10 science: cbse class 10 science board exam 2024 is just around the corner and students are working hard to score maximum marks. check these case study questions from class 10 science to ace your examination this year also download the solutions from the pdf attached towards the end. .

CBSE Class 10 Science Chapter Wise Important Case Study Questions: While the CBSE Board exam for Class 10 students are ongoing, the CBSE Class 10 Science board exam 2024 is to be held on March 2, 2024. With the exams just a  few days away, CBSE Class 10th Board exam candidates are rushing to prepare the remaining syllabus, practising their weak portions, trying to revise the important questions from the past year papers, practise questions, etc. 

Why are CBSE Class 10 Science Case Study Questions Important?

• Section A : 20 Multiple Choice Questions (MCQs) carrying 1 mark each.  
• Section B : 6 Very Short Answer type questions carrying 2 marks each. Answers to these questions should be in the range of 30 to 50 words.  
• Section C : 7 Short Answer type questions carrying 3 marks each. Answers to these questions should be in the range of 50 to 80 words.  
• Section D : 3 Long Answer type questions carrying 5 marks each. Answers to these questions should be in the range of 80 to 120 words.
• Section E : 3 Case Based/ Source Based units of assessment (4 marks each) with sub-parts.  

How to solve case study questions in CBSE Class 10 Science?

• Read the case given and the associated questions carefully.
• Read the questions attentively and analyse what they are asking.
• Apply your subject knowledge and theories in the given case to decide what the correct answers should be.

1.A chemical reaction is a representation of chemical change in terms of symbols and formulae of reactants and products. There are various types of chemical reactions like combination, decomposition, displacement, double displacement, oxidation and reduction reactions. Reactions in which heat is released along with the formation of products are called exothermic chemical reactions. All combustion reactions are exothermic reactions.

(i) The massive force that pushes the rocket forward through space is generated due to the

(a) combination reaction

(b) decomposition reaction

(c) displacement reaction

(d) double displacement reaction

(ii) A white salt on heating decomposes to give brown fumes and yellow residue is left behind. The yellow residue left is of

(a) lead nitrate

(b) nitrogen oxide

(c) lead oxide

(d) oxygen gas

(iii) Which of the following reactions represents a combination reaction?

(a) CaO (s) + H2O (l) → Ca (OH)2 (aq)

(b) CaCO3 (s) → CaO (s) + CO2(g)

(c) Zn(s) + CuSO4 (aq) → ZnSO4 (aq) + Cu(s)

(d) 2FeSO4(s) → Fe2O3 (s) +SO2(g) + SO3(g)

(iv) Complete the following statements by choosing correct type of reaction for X and Y.

Statement 1: The heating of lead nitrate is an example of ‘X’ reaction.

Statement 2: The burning of magnesium is an example of ‘Y’ reaction.

(a)X-Combination,Y-Decomposition

(b)X-Decomposition,Y-Combination

(c)X-Combination,Y-Displacement

(d) X- Displacement, Y-Decomposition

2.The earlier concept of oxidation and reduction is based on the addition or removal of oxygen or hydrogen elements so, in terms of oxygen and hydrogen, oxidation is addition of oxygen to a substance and removal of hydrogen from a substance. On the other hand, reduction is addition of hydrogen to a substance and removal of oxygen from a substance. The substance which gives oxygen to another substance or removes hydrogen from another substance in an oxidation reaction is known as oxidising agent, while the substance which gives hydrogen to another substance or removes oxygen from another substance in a reduction reaction is known as reducing agent. For example, 

(i) A redox reaction is one in which

(a) both the substances are reduced

(b) both the substances are oxidised

(c) an acid is neutralised by the base

(d) one substance is oxidised while the other is reduced.

(ii) In the reaction, H2S+Cl2⟶S+2HCl

(a) H2S is the reducing agent. 

(b) HCl is the oxidising agent.

(c) H2S is the oxidising agent. 

(d) Cl2 is the reducing agent.

(iii) Which of the following processes does not involve either oxidation or reduction?

(a) Formation of slaked lime from quicklime.

(b) Heating mercuric oxide.

(c) Formation of manganese chloride from manganese oxide (MnO2).

(d) Formation of zinc from zinc blende.

(iv) Mg+CuO⟶MgO+Cu

Which of the following is wrong relating to the above reaction?

(a) CuO gets reduced

(b) Mg gets oxidised.

(c) CuO gets oxidised. 

(d) It is a redox reaction.

3.A copper vessel gets tarnished due to formation of an oxide layer on its surface. On rubbing lemon on the vessel, the surface is cleaned, and the vessel begins to shine again. This is due to the fact that which reacts with the acid present in lemon to form a salt which is washed away with water. As a result, the layer of copper oxide is removed from the surface of the vessel and the shining surface is exposed.

1.Which of the following acids is present in lemon?

(a) Formic acid

(b) Acetic acid

(c) Citric acid

(d) Hydrochloric acid

2.The nature of copper oxide is

d) amphoteric

3.Name the salt formed in the above reaction

a) copper carbonate

b) copper chloride

c)copper citrate

d) copper citrate

4.The phenomenon of copper getting tarnished is

a) corrosion

b) rancidity

c) displacement

d)none of these

4.Metals as we know, are very useful in all fields, industries in particular. Non-metals are no less in any way. Oxygen present in air is essential for breathing as well as for combustion. Non-metals form a large number of compounds which are extremely useful, e.g., ammonia, nitric acid, sulphuric acid, etc. Non-metals are found to exist in three states of matter. Only solid non-metals are expected to be hard however, they have low density and are brittle. They usually have low melting and boiling points and are poor conductors of electricity.

i.____________ is a non-metal but is lustrous

A.Phosphorus

ii.Which of the following is known as 'King of chemicals'?

C. Sulphuric acid

D. Nitric acid

iii.Which of the following non-metals is a liquid?

iv.Hydrogen is used

A.for the synthesis of ammonia

B. for the synthesis of methyl alcohol

C.nitrogenous fertilizers

D. all of these

5.Nisha observed that the bottoms of cooking utensils were turning black in colour while the flame of her stove was yellow in colour. Her daughter suggested cleaning the air holes of the stove to get a clean, blue flame. She also told her mother that this would prevent the fuel from getting wasted.

a) Identify the reasons behind the sooty flame arising from the stove.

b) Can you distinguish between saturated and unsaturated compounds by burning them? Justify your answer.

c) Why do you think the colour of the flame turns blue once the air holes of the stove are cleaned?

6.Blood transport food, Oxygen and waste materials in our bodies. It consists of plasma as a fluid medium. A pumping organ [heart] is required to push the blood around the body. The blood flows through the chambers of the heart in a specific manner and direction. While flowing throughout the body, blood exerts a pressure against the wall or a vessel.

• Pulmonary artery
• Pulmonary vein
• Very narrow and have high resistance
• Much wide and have low resistance
• Very narrow and have low resistance
• Much wide and have high resistance
• It is a hollow muscular organ
• It is four chambered having three auricles and one ventricle.
• It has different chambers to prevent O2 rich blood from mixing with the blood containing CO2
• Both A & C
• Blood = Plasma + RBC + WBC + Platelets
• Plasma = Blood – RBC
• Lymph = Plasma + RBC
• Serum = Plasma + RBC + WBC

7.A brain is displayed at the Allen Institute for Brain Science. The human brain is a 3-pound (1.4-kilogram) mass of jelly-like fats and tissues—yet it's the most complex of all known living structures The human brain is more complex than any other known structure in the universe. Weighing in at three pounds, on average, this spongy mass of fat and protein is made up of two overarching types of cells—called glia and neurons— and it contains many billions of each. Neurons are notable for their branch-like projections called axons and dendrites, which gather and transmit electrochemical signals. Different types of glial cells provide physical protection to neurons and help keep them, and the brain, healthy. Together, this complex network of cells gives rise to every aspect of our shared humanity. We could not breathe, play, love, or remember without the brain.

1)Animals such as elephants, dolphins, and whales actually have larger brains, but humans have the most developed cerebrum. It's packed to capacity inside our skulls and is highly folded. Why our brain is highly folded?

• b) Learning

3)Which among these protects our brain?

a)Neurotransmitter

b) Cerebrospinal fluid

d) Grey matter

4.Ram was studying in his room. Suddenly he smells something burning and sees smoke in the room. He rushes out of the room immediately. Was Ram’s action voluntary or involuntary? Why?

8.Preeti is very fond of gardening. She has different flowering plants in her garden. One day a few naughty children entered her garden and plucked many leaves of Bryophyllum plant and threw them here and there in the garden. After few days, Preeti observed that new Bryophyllum plants were coming out from the leaves which fell on the ground.

1.What does the incident sited in the paragraph indicate?

(a). Bryophyllum leaves have special buds that germinate to give rise to new plant.

(b). Bryophyllum can propagate vegetatively through leaves.

(c). Bryophyllum is a flowering plant that reproduces only asexually

(d). Both (a) and (b).

2.Which of the following plants can propagate vegetatively through leaves like Bryophyllum?

3.Do you think any other vegetative part of Bryophyllum can help in propagation? If yes, then which part?

(c) Flowers

4.Which of the following plant is artificially propagated (vegetatively) by stem cuttings in horticultural practices?

(b)Snakeplant

(d)Water hyacinth

9.The growing size of the human population is a cause of concern for all people. The rate of birth and death in a given population will determine its size. Reproduction is the process by which organisms increase their population. The process of sexual maturation for reproduction is gradual and takes place while general body growth is still going on. Some degree of sexual maturation does not necessarily mean that the mind or body is ready for sexual acts or for having and bringing up children. Various contraceptive devices are being used by human beings to control the size of the population.

1) What are common signs of sexual maturation in boys?

a) Broadening of shoulders

b) Development of mammary glands

c) Broadening of waist

d) High pitch of voice

2) Common sign of sexual maturation in girls is

a) Low pitch voice

b) Appearance of moustache and beard

c) Development of mammary glands

d) Broadening of shoulders

3) Which contraceptive method changes the hormonal balance of the body?

b) Diaphragms

c) Oral pills

d) Both a) and b)

4) What should be maintained for healthy society?

a) Rate of birth and death rate

b) Male and female sex ratio

c) Child sex ratio

d) None of these

10.Pea plants can have smooth seeds or wrinkled seeds. One of the phenotypes is completely dominant over the other. A farmer decides to pollinate one flower of a plant with smooth seeds using pollen from a plant with wrinkled seeds. The resulting pea pod has all smooth seeds.

i) Which of the following conclusions can be drawn?

(1) The allele for smooth seeds is dominated over that of wrinkled seeds.

(2) The plant with smooth seeds is heterozygous.

(3) The plant with wrinkled seeds is homozygous.

(b) 1 and 2 only

(c) 1 and 3 only

(d) 1, 2 and 3

ii) Which of the following crosses will give smooth and wrinkled seeds in same proportion?

(a) RR X rr

(b) Rr X rr

(d) rr X rr

iii) Which of the following cross can be used to determine the genotype of a plant with dominant phenotype?

(a) RR X RR

(b) Rr X Rr

(c) Rr X RR

(d) RR X rr

iv) On crossing of two heterozygous smooth seeded plants (Rr), a total of 1000 plants were obtained in F1 generation. What will be the respective number of smooth and wrinkled seeds obtained in F1 generation?

(a) 750, 250

(b) 500, 500

(C) 800, 200

(d) 950, 50

11.Food chains are very important for the survival of most species.When only one element is removed from the food chain it can result in extinction of a species in some cases.The foundation of the food chain consists of primary producers.Primary producers or autotrophs,can use either solar energy or chemical energy to create complex organic compounds,whereas species at higher trophic levels cannot and so must consume producers or other life that itself consumes producers. Because the sun’s light is necessary for photosynthesis,most life could not exist if the sun disappeared.Even so,it has recently been discovered that there are some forms of life,chemotrophs,that appear to gain all their metabolic energy from chemosynthesis driven by hydrothermal vents,thus showing that some life may not require solar energy to thrive.

1.If 10,000 J solar energy falls on green plants in a terrestrial ecosystem,what percentage of solar energy will be converted into food energy?

(d)It will depend on the type of the terrestrial plant

2.Matter and energy are two fundamental inputs of an ecosystem. Movement of

(a)Energy is by directional and matter is repeatedly circulating

(b)Energy is repeatedly circulating and matter is unidirectional

(c)Energy is unidirectional and matter is repeatedly circulating

(d)Energy is multidirectional and matter is bidirectional

3.Raj is eating curd/yoghurt. For this food intake in a food chain he should be considered as occupying

(a)First trophic level

(b)Second trophic level

(c)Third trophic level

(d)Fourth trophic level

4.Which of the following, limits the number of trophic levels in a food chain

(a)Decrease in energy at higher trophic levels

(b)Less availability of food

(c)Polluted air

5.The decomposers are not included in the food chain. The correct reason for the same is because decomposers

(a) Act at every trophic level at the food chain

(b) Do not breakdown organic compounds

(c) Convert organic material to inorganic forms

(d) Release enzymes outside their body to convert organic material to inorganic forms

12.Shyam participated in a group discussion in his inter school competition on the practical application of light and was very happy to win an award for his school. That very evening his father gave treat to celebrate Shyam’s win. Shyam while sitting saw an image of a person sitting at his backside in his curved plate and could see that person’s mobile drop in the flower bed. Person was not aware until Shyam went and informed him. He thanked Shyam for his clever move.

a)From which side of his plate Shyam observed the incident –

i)outward curved

ii)inward curved

iii)plane surface

b)Part of plate from which Shyam observed the incident acted like a-

i)concave mirror

ii)convex mirror

iii)plane mirror

c)The nature of the size of the image formed in above situation is –

i)real, inverted and magnified

ii)same size , laterally inverted

iii)virtual, erect and diminished

iv)real , inverted and diminished

d)Magnification of the image formed by convex mirror is –

more than 1

iii)equal to 1

iv)less than 1

• The location of image formed by a convex lens when the object is placed at infinity is

(a) at focus

(c) at optical center

• When the object is placed at the focus of concave lens, the image formed is

(a)real and smaller

(b) virtual and smaller

(c) virtual and inverted

• The size of image formed by a convex lens when the object is placed at the focus ofconvex lens is

(a) highly magnified

(b) point in size

• When the object is placed at 2F in front of convex lens, the location of image is

(b) between F and optical center

(c) at infinity

(d) none of the above

14.One of the wires in domestic circuits supply, usually with a red insulation cover, is called live wire. with black insulation is called neutral wire. The earth wire, which has insulation of green colour, is usually connected to a metal plate deep in the earth near the house appliances that has a metallic body. Overloading contact, in such a situation the current in the circuit abruptly increases. circuit prevents damage to the appliances and the circuit due to overloading.

1 When do we say that an electrical appliance

2 Mention the function of earth wire in electrical line

3 How is an electric fuse connected in a domestic circuit?

4 When overloading and short circuiting are said to occur?

5 What is a live wire?

15.Light of all the colours travel at the same speed in vacuum for all wavelengths. But in any transparent medium(glass or water), the light of different colours travels at different speeds for different wavelengths, which means that the refractive index of a particular medium is different for different wavelengths. As there is a difference in their speeds, the light of different colours bend through different angles. The speed of violet colour is maximum and the speed of red colour is minimum in glass so, the red light deviates least and violet colour deviates most. Hence, higher the wavelength of a colour of light, smaller the refractive index and less is the bending of light.

(i)Which of the following statements is correct regarding the propagation of Light of different colours of white light in air?

(a) Red light moves fastest.

(b) Blue light moves faster than green light.

(c) All the colours of the white light move with the same speed.

(d) Yellow light moves with the mean speed as that of the red and the violet light.

(ii)Which of the following is the correct order of wavelength?

(a) Red> Green> Yellow

(b) Red> Violet> Green

(c) Yellow> Green> Violet

(d) Red> Yellow> Orange

(iii)Which of the following is the correct order of speed of light in glass?

(a) Red> Green> Blue

(b) Blue> Green> Red

(c) Violet> Red> Green

(d) Green> Red> Blue

(iv)Which colour has maximum frequency?

16.The region around a magnet where magnetism acts is represented by the magnetic field.The force of magnetism is due to moving charge or some magnetic material. Like stationary charges produce an electric field proportional to the magnitude of charge, moving charges produce magnetic fields proportional to the current. In other words, a current carrying conductor produces a magnetic field around it. The subatomic particles in the conductor, like the electrons moving in atomic orbitals, are responsible for the production of magnetic fields. The magnetic field lines around a straight conductor (straight wire) carrying current are concentric circles whose centres lie on the wire.

1)The magnetic field associated with a current carrying straight conductor is in anti- clockwise direction. If the conductor was held horizontally along east west direction,what is the direction of current through it?

2)Name and state the rule applied to determine the direction of magnetic field in a straight current carrying conductor.

3)Ramus performs an experiment to study the magnetic effect of current around a current carrying straight conductor with the help of a magnetic compass. He reports that

a)The degree of deflection of magnetic compass increases when the compass is moved away from the conductor.

b)The degree of deflection of the magnetic compass increases when the current through the conductor is increased.

Which of the above observations of the student appears to be wrong and why?

Case Study Questions Class 10 Science CBSE Chapter Wise PDF

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• Chemical Reactions and Equations Class 10 Case Study Questions Science Chapter 1

Last Updated on August 26, 2024 by XAM CONTENT

Hello students, we are providing case study questions for class 10 science. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 10 science. In this article, you will find case study questions for cbse class 10 science chapter 1 Chemical Reactions and Equations.

Table of Contents

Case Study Questions on Chemical Reactions and Equations

Question 1:

Rahul is a skilled painter. He mixed a white coloured powder, compound X with water. The compound X reacted vigorously with water to produce a compound Y and a large amount of heat. Then, Rahul used the compound Y for white washing the walls. Customer was not satisfied with the work of Rahul as walls were not shining. But Rahul guaranteed him that the walls would shine after 2-3 days and after 3 days of whitewash, the walls became shiny.

Read the above passage carefully and give the answer to the following questions:

Q 1. Name the compound X, that Rahul mixed with water.

Difficulty Level: Medium

Ans. The compound X is calcium oxide (CaO).

Q 2. Name the compound Y, that Rahul got after mixing X with water.

Ans. Compound Y is calcium hydroxide.

Q 3. What type of reaction has occurred here?

Difficulty Level: Easy

Ans. Combination reaction

Q 4. Write the chemical reaction responsible for shiny finish of the walls.

Ans. Ca (OH) 2 (aq) + CO 2 (g) → CaCO 3 (s) + H 2 O (l)

Q 5. Write the common name of X and Y.

Ans. Common name of CaO (X) is quick lime and that of Ca(OH) 2  is slaked lime.

• Electricity Class 10 Case Study Questions Science Chapter 12
• The Human Eye and the Colourful World Class 10 Case Study Questions Science Chapter 11
• Metals and Non-metals Class 10 Case Study Questions Science Chapter 3
• Light – Reflection and Refraction Class 10 Case Study Questions Science Chapter 10

Life Processes Class 10 Case Study Questions Science Chapter 6

Acids bases and salts class 10 case study questions science chapter 2, you may also like.

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Topics from which case study questions may be asked

• Understand the concept of chemical reactions and their importance in daily life.
• Learn to write chemical equations for different types of chemical reactions.
• Master the skill of balancing chemical equations.
• Identify and classify different types of chemical reactions, such as combination, decomposition, displacement, double displacement, and redox reactions.
• Explore the concepts of oxidation and reduction in chemical reactions.
• Understand the phenomena of corrosion and rancidity and their prevention methods.
• Recognize the applications of chemical reactions in various industries and everyday scenarios.
• Develop critical thinking skills by analyzing and predicting the outcomes of chemical reactions.
• Appreciate the role of chemical reactions in environmental processes and human activities.

This chapter deals with introducing students to the fundamental concepts of chemical reactions, equations, and their implications.

Important Links for CBSE Class 10 Science Chapter 1 Chemical Reactions and Equations

• Download 59 Important Questions for Chemical Reactions and Equations
• Download Chapter Test for Chemical Reactions and Equations

Helpful Links for CBSE Class 10 Science Preparation

• Download 125 Important Case Study Questions for CBSE Class 10 Science
• Download 220 Important Assertion Reason Questions for CBSE Class 10 Science
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• Download 65 Important Numerical Problems for CBSE Class 10 Physics
• Download 60 Important Diagram Based Questions for CBSE Class 10 Physics
• Download 150 Most Repeated Questions for CBSE Class 10 Science
• Download Chapter Test for CBSE Class 10 Science

Frequently Asked Questions (FAQs) on Chemical Reactions and Equations Case Study Questions

Q1: what are case study questions for cbse examinations.

A1: Case study questions in CBSE examinations typically involve scenarios or real-life examples, requiring students to apply their understanding of concepts to solve problems or analyze situations.

Q2: Why are case study questions important for understanding class 10 science chapters?

A2: Case study questions provide a practical context for students to apply theoretical knowledge to real-world situations, fostering deeper understanding and critical thinking skills.

Q3: How should students approach answering case study questions for CBSE?

A3: Students should carefully read the case study, identify the key issues or problems presented, analyze the information provided, apply relevant concepts and principles of chemical reactions and equations, and formulate well-supported solutions or responses.

Q4: Are there any resources available online for students to practice case study questions on class 10 science chapters for CBSE exams?

A4: Yes, several educational websites offer case study questions for CBSE students preparing for science examinations. We also offer a collection of case study questions for all classes and subject on our website. Visit our  website  to access these questions and enhance your learning experience. If you need more case study questions for your preparation, then you visit Physics Gurukul website.

Q5: How can students effectively prepare for case study questions on chemical reactions and equations for CBSE exams?

A5: Effective preparation strategies include regular revision of concepts, solving practice questions, analyzing case studies from previous exams, seeking clarification on doubts, and consulting with teachers or peers for guidance and support.

Q6: How can teachers incorporate case study questions on chemical reactions and equations class 10 science into classroom teaching?

A6: Teachers can integrate case studies into lesson plans, group discussions, or interactive activities to engage students in active learning, promote problem-solving skills, and facilitate a deeper understanding of chemical reactions and equations.

Q7: Name the law based on which chemical equations must be balanced.

A7: Law of conservation of mass. Mass can neither be created nor can it be destroyed during a chemical reaction.

Q8: List any two observations when ferrous sulphate is heated in a dry test tube.

A8: (i) Initial light green colour changes to reddish brown colour. (ii) Colourless gas is evolved. (iii) Gas with choking smell is evolved

Q9: Why do silver articles become black after some time, when exposed to air?

A9: They get tarnished by reacting with atmospheric air to form silver sulphide.

Q10: Give reason why do chips manufacturers usually flush bags of chips with gas such as nitrogen?

A10: To prevent the oil and fats of the chips from being oxidized or become rancid.

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Class 10 Science: Case Study Chapter 1 Chemical Reactions and Equations PDF Download

In CBSE Class 10 Science Paper, Students will have to answer some questions based on  Assertion and Reason . There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given.

Here we are providing you with Class 10 Science Chapter 1 Chemical Reactions and Equations Case Study Questions, by practicing this Case Study and Passage Based Questions will help you in your Class 10th Board Exam.

Case Study Chapter 1 Chemical Reactions and Equations

Question 1:

A chemical reaction is a representation of chemical change in terms of symbols and formulae of reactants and products. There are various types of chemical reactions like combination, decomposition, displacement, double displacement, oxidation, and reduction reactions. Reactions in which heat is released along with the formation of products are called exothermic chemical reactions. All combustion reactions are exothermic reactions.

(i) The chemical reaction in which a single substance breaks down into two or simpler substances upon heating is known as (a) thermal decomposition reaction (b) photodecomposition reaction (c) electric decomposition reaction (d) both (a) and (c)

Answer: (a) The chemical reaction in which a single substance breaks down into two or more simpler substances upon heating is known as thermal decomposition reaction.

(ii) The massive force that pushes the rocket forward through space is generated due to the (a) combination reaction (b) decomposition reaction (c) displacement reaction (d) double displacement reaction

Answer: (b) The massive force that pushes the rocket forward through space is generated due to the decomposition reaction. Hydrogen peroxide decomposes and provides it with a considerable reaction force thrust.

(iii) A white salt on heating decomposes to give brown fumes and the yellow residue is left behind. The yellow residue left is of (a) lead nitrate (b) nitrogen oxide (c) lead oxide (d) oxygen gas

Answer: (c) Lead nitrate decomposes to give brown fumes of nitrogen dioxide gas and yellow residue of lead oxide is left behind.

(iv) Which of the following reactions represents a combination reaction? (a) CaO (s) + H 2 O (l) → Ca(OH) 2  (aq) (b) CaCO 3  (s) → CaO (s) + CO 2 (g) (c) Zn(s) + CuSO 4  (aq) → ZnSO 4  (aq) + Cu(s) (d) 2FeSO 4 (s) → Fe 2 O 3  (s) +SO 2 (g) + SO 3 (g)

Answer: (a) A reaction in which two or more reactants combine to form a single product is known as a combination reaction.

(v) Complete the following statements by choosing correct type of reaction for X and Y. Statement 1:  The heating of lead nitrate is an example of ‘X’ reaction. Statement 2:  The burning of magnesium is an example of ‘Y’ reaction. (a) X- Combination, Y- Decomposition (b) X- Decomposition, Y-Combination (c) X- Combination, Y-Displacement (d) X- Displacement, Y-Decomposition

Answer: (b) Heating of lead nitrate to form nitrogen dioxide and lead oxide is an example of thermal decomposition reaction and the burning of magnesium ribbon in the air to form magnesium oxide is an example of combination reaction.

Question 2:

In a chemical reaction, reactants are converted into products. The conversion of reactants into products in a chemical reaction is often accompanied by some features which can be observed easily. These easily observed features which take place as a result of chemical reactions are known as characteristics of chemical reactions. Some important characteristics of chemical reactions are:  (I) Evolution of heat  (II) Formation of a precipitate (III) Change in color (IV) Change in temperature (V) Change in state

Anyone of these general characteristics can tell us whether a chemical reaction has taken place or not.

(i) Reaction of magnesium with air is a/an

Answer: (a) exothermic reaction

(ii) In the following reaction Ca 2+ (aq)+2OH−(aq)⟶Ca(OH) 2 (s)Ca(aq) 2 ++2OH(aq)−⟶Ca(OH) 2 (s) precipitate of calcium hydroxide will be of

Answer: (d) white colour

(iii) In the given reaction, S(s)+O 2 (g)⟶SO 2 S(s)+O 2 (g)⟶SO 2 the physical state of SO 2  is

Answer: (c) gaseous 

(iv) Which one of the following processes involves chemical reactions?

Answer: (d) Heating copper wire in the presence of air at high temperature.

(v) In which of the following reactions, a high amount of heat energy will be evolved?

Answer: (c) Burning of L.P.G.

You can also practice Class 10 Science MCQ Questions for Board Exams.

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Chemical Reactions and Equations Case Study Based Questions Class 10

Students who are studying in CBSE class 10 board, need to get the knowledge about the Chemical Reactions and Equations Case Study Based Questions. Case based questions are generally based on the seen passages from the chapter Chemical Reactions and Equations. Through solving the case based questions, students can understand each and every concept. 

 With the help of Chemical Reactions and Equations Case Study Based Questions, students don’t need to memorise each answer. As answers for these case studies are already available in the given passage. Questions are asked through MCQs so student’s won’t take time to mark the answers. These multiple choice questions can help students to score the weightage of Chemical Reactions and Equations. 

Chemical Reactions and Equations Case Study Based Questions with Solutions 

Selfstudys provides case studies for the Class 10 Science chapter Chemical Reactions and Equations with solutions. The Solutions can be helpful for students to refer to if there is a doubt in any of the case studies problems. The solutions from the Selfstudys website are easily accessible and free of cost to download. This accessibility can help students to download case studies from anywhere with the help of the Internet. 

Chemical Reactions and Equations Case Study Based Questions with solutions are in the form of PDF. Portable Document Format (PDF) can be downloaded through any of the devices: smart phone, laptop. Through this accessibility, students don't need to carry those case based questions everywhere. 

Features of Chemical Reactions and Equations Case Study Based Questions

Before solving questions, students should understand the basic details of Chemical Reactions and Equations. Here are the features of case based questions on Chemical Reactions and Equations are:

• These case based questions start with short or long passages. In these passages some concepts included in the chapter can be explained.
• After reading the passage, students need to answer the given questions. These questions are asked in the Multiple Choice Questions (MCQ). 
• These case based questions are a type of open book test. These case based questions can help students to score well in the particular subject. 
•  These Chemical Reactions and Equations Case Study Based Questions can also be asked in the form of CBSE Assertion and Reason .

Benefits of Solving Chemical Reactions and Equations Case Study Based Questions

According to the CBSE board, some part of the questions are asked in the board exam question papers according to the case studies. As some benefits of solving Chemical Reactions and Equations Case Study Based Questions can be obtained by the students. Those benefits are: 

• Through solving case studies students will be able to understand every concept included in the chapter Chemical Reactions and Equations
• Passages included in the case study are seen passages, so students don’t need to struggle for getting answers. As these questions and answers can be discussed by their concerned teacher. 
• Through these students can develop their observation skills. This skill can help students to study further concepts clearly. 
• Case studies covers all the concepts which are included in the Chemical Reactions and Equations

How to Download Chemical Reactions and Equations Case Based Questions? 

Students studying in CBSE class 10 board, need to solve questions based on case study. It is necessary for students to know the basic idea of Chemical Reactions and Equations Case Study Based Questions. Students can obtain the basic idea of case based questions through Selfstudys website. Easy steps to download it are:

• Open Selfstudys website. 

• Bring the arrow towards CBSE which is visible in the navigation bar. 

• A pop-up menu will appear, Select case study from the list. 

• New page will appear, select 10 from the list of classes. 

• Select Science from the subject list. 

• And in the new page, you can access the Chemical Reactions and Equations Case Study Based Questions. 

Tips to solve Chemical Reactions and Equations Case Study Questions-

Students should follow some basic tips to solve Chemical Reactions and Equations Case Study Based Questions. These tips can help students to score good marks in CBSE Class 10 Science. 

• Generally, the case based questions are in the form of Multiple Choice Questions (MCQs). 
• Students should start solving the case based questions through reading the given passage. 
• Identify the questions and give the answers according to the case given. 
• Read the passage again, so that you can easily answer the complex questions. 
• Answer according to the options given below the questions provided in the Chemical Reactions and Equations Case Study Based Questions. 

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Class 10 Science Chapter 1 Case Based Questions - Chemical Reactions and Equations

Question 1: The substance not likely to contain CaCO 3 is (a)  Dolomite (b)  A marble statue (c)  Calcined gypsum (d) Sea shells.

Correct Answer is Option (c) Let’s write the Chemical formula for all of them Dolomite → (CaMg(CO 3 ) 2 ) A marble statue → Recrystallized carbonate minerals commonly calcite (CaCO 3 ) or dolomite (CaMg(CO 3 ) 2 ) Calcined Gypsum →  CaSO 4 .2H 2 O; Sea shells → CaCO 3

Question 2: Gas A, obtained above is a reactant for a very important biochemical process which occurs in the presence of sunlight. Identify the name of the process - (a) Respiration (b) Photosynthesis (c)  Transpiration (d)  Photolysis

Correct Answer is Option (b) The following reaction takes place when CaCO 3 is heated; CaCO 3 → CaO + CO 2 Answer is (b) photosynthesis CO 2 is the gas formed and it is utilized in the process of photosynthesis

Question 3: Calcium oxide can be reduced to calcium, by heating with sodium metal. Which compound would act as an oxidizing agent in the above process?  (a)  sodium (b)  sodium oxide (c)  calcium (d)  calcium oxide

Correct Answer is Option (d) Here, Calcium Oxide is losing Oxygen and undergoing reduction A substance that undergoes reduction is an oxidising agent . Thus Calcium Oxide is the oxidising agent

Chemistry in Automobiles: For an internal combustion engine to move a vehicle down the road, it must convert the energy stored in the fuel into mechanical energy to drive the wheels. In your car, the distributor and battery provide this starting energy by creating an electrical "spark", which helps in combustion of fuels like gasoline. Below is the reaction depicting complete combustion of gasoline in full supply of air: 2C 8 H 18 (l) + 25O 2 (g) → 16 'X' + Y Question 4: Identify the types of chemical reaction occurring during the combustion of fuel:  (a)  Oxidation & Endothermic reaction (b)  Decomposition & Exothermic reaction (c)  Oxidation & Exothermic reaction (d)  Combination & Endothermic reaction

Correct Answer is Option (c) Here Decomposition Reaction:  The reaction in which complex compounds are broken down into simpler ones i.e. AB → A + B Oxidation Reaction: The reaction in which an oxygen atom is gained i.e. A + O 2 → AO 2 Combination Reaction: When two or more substances combine to form a single product i.e. A + B → AB And, Endothermic Reaction: Endo means in and thermic means heat. In these reactions, heat is absorbed. Exothermic Reaction: Exo means out and thermic means heat. In these reactions, heat is released. Since in Combustion Energy is released Oxygen is gained Thus, it is an oxidation and exothermic reaction So, the correct answer is (c)

Question 5:  A student while walking on the road observed that a cloud of black smoke belched out from the exhaust stack of moving trucks on the road.’ Choose the correct reason for the production of black smoke: (a)  Limited supply of air leads to incomplete combustion of (b)  Rich supply of air leads to complete combustion of fuel. (c) Rich supply of air leads to a combination reaction. (d)  Limited supply of air leads to complete combustion of fuel.

Correct Answer is Option (a) In the presence of  limited supply of air , there isn’t enough oxygen to carry out complete combustion of fuels. Therefore, incomplete combustion takes place and a black sooty flame is observed Behind  black smoke from car

The physical states of the reactants and products can be represented by using the symbols (s) for solids, (l) for liquids, (g) for gases and (aq) for aqueous solution along with their respective formulae. The word aqueous is written if the reactant or product is present as a solution in water. Precipitate can also be represented by using an arrow pointing downwards (↓) instead of using symbol (s). In the same way, the gaseous state of an evolved gas can be represented by using an arrow pointing upward direction (↑) instead of using symbol (g). The specific condition of the reaction like temperature, pressure, catalyst etc. is written above or below the arrow in the chemical equation. Question 6:  If the reactant or product is present as a solution of water, it is represented as:  (a) (s) (b) (l) (c)  (aq) (d)  ↓

Correct Answer is Option (c) Reaction of Silver Nitrate with Sodium Chloride

Question 7: Complete the missing variable given as X and Y in the following reaction: 2Na (s) + 2H 2 O (l) → 2NaOH (X) + H 2 (Y) (a)  (aq) and (g) (b)  (s) and (g) (c) (g) and  (l) (d) (g) and (aq)

Correct Answer is Option (a) Here, Since Na is reacting with water , the NaOH produced will be in  aqueous medium , hence (aq) symbol will be used. H 2 is a gas which is evolved during the reaction, so we use the symbol (g) for it. So, the correct answer is (a) (aq) and (g)

Question 8: Which of the following reactions is correct? (a)  Mg (aq) + H 2 SO 4 (aq) → MgSO 4 (aq) + H 2 ↑ (b)  Mg (s) + H 2 SO 4 (aq) → MgSO 4 (aq) + H 2 ↑ (c)  Mg (s) + H2SO 4 (l) → MgSO 4 (l) + H 2 (g) (d)  Mg (s) + H 2 SO 4 (l) → MgSO 4 (s) + H 2

Correct Answer is Option (b) A balanced chemical equation is one in which the number of atoms of both reactants and products are equal. In reaction I: In reaction II: Since the number of all atoms in reactants and products is equal, it is a balanced equation. In reaction III: In Reaction IV:

In the following chemical reaction ‘‘zinc oxide reacts with carbon to produce zinc metal and carbon monoxide.’’ Answer any four question from I to V. ZnO + C → Zn + CO

Question 9: Name the substance getting oxidised and reduced in the above reaction: (a)  C and ZnO (b)  Zn and C (c)  ZnO and CO (d)  CO and  ZnO

Correct Answer is Option (a) Oxidation and Reduction Reaction Example Now, Addition of oxygen is known as oxidation Removal of oxygen is known as  reduction. Since in the equation Oxygen is being removed from ZnO and is added to C. Therefore, C is undergoing oxidation and ZnO reduction. So, the correct answer is (a) C and ZnO

Question 10: The reduction reaction involves:   (a) gain of electrons (b)  loss of electrons (c)  increase in oxidation state (d)  addition of oxygen

Correct Answer is Option (a) Reduction is the transfer of electrons between species in a chemical reaction where there is a process of gaining electrons or a decrease in the oxidation state by an element. A reduction chemical reaction involves increasing electrons associated with a single atom or a group of atoms.

Question 11: The reactions used in black and white photography:   (i)  Decomposition of silver bromide   (ii)  Decomposition of silver chloride   (iii) Both   (iv)  None of the above

Correct Answer is Option (c) Black and white photography is looks like The photographic papers are prepared by using silver chloride and silver bromide which are initially white in color. On exposure to air, AgCl and AgBr decompose and lose their color and black and white images are obtained. So, the correct answer is (c) Both Reactions Involved In Black And White Photography

P, Q and R are 3 elements which undergo chemical reactions according to the following equations Answer any four question from I to V: (i) P 2 O 3 + 2Q → Q 2 O 3 + 2P (ii) 3RSO 4 + 2Q → Q 2 (SO 4 ) 3 + 3R (iii) 3RO + 2P → P 2 O 3 + 3R Question 12: The most reactive and the least reactive elements are: (a) Q and P (b) Q and R (c)  R and Q (d)  R and P

Correct Answer is Option (b) In the first reaction , Q is able to replace P from its salt i.e. P 2 O 3 , Q  is more reactive than P . In the second reaction, Q is also able to replace R from its salt solution i.e. RSO 4 , Q is more reactive than R . In the third reaction, P is able to replace r from its oxide, so, P is more reactive than R Therefore, the r eactivity order is: Q > P > R (Q being the most reactive and R being the least) Thus, Most  Reactive is  Q   Least Reactive is  R So, the correct answer is (b)

Question 13: 3RSO 4 + 2Q → Q 2 (SO 4 ) 3 + 3R The given reaction shows: (a)  Q is more reactive than R (b)  Q is less reactive than R (c)  Q and R are equally reactive (d) none of the above

Correct Answer is Option (a) Since in this reaction, Q is able to replace R from its salt RSO 4, Therefore, Q is more reactive than R. So, the correct answer is (a)

Question 14: Na 2 SO 4 (aq) + BaCl 2 (aq) → BaSO 4 (s) + 2NaCl(aq) The above reaction is an example of: (a)  Double displacement reaction. (b)  Displacement reaction. (c)  Can be both. (d)  None of the above.

Correct Answer is Option (a) Since in this reaction the two reacting compounds are switching their positive and negative ions, it is a double displacement reaction. So, the correct answer is (a)

Question 15: The type of reaction is: (a)  Displacement reaction (b)  Combination reaction (c)  Neutralisation reaction (d)  Substitution reaction

Correct Answer is Option (a) Let’s look at all the options Displacement Reaction:  Reaction in which more reactive element takes the place of less reactive element. Combination Reaction: When two or more substances react to form a single product, it is known as combination reaction. Neutralisation reaction:  A reaction in which acid and base react to form salt and water Substitution Reaction:  In this reaction, one functional group in a chemical compound is replaced by another. Since in the above mentioned reactions, the more reactive elements (Q, P) are replacing the less reactive element (R), this is a displacement reaction . So, the correct answer is (a) Displacement reaction

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