Chemical Reactions And Equations MCQs | Class 10 Science Chapter 1 Quiz

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Are you preparing for CBSE Class 10 Science Chapter 1 – Chemical Reactions and Equations? Test your knowledge with these MCQs based on the latest NCERT syllabus. This quiz will help you revise important concepts like types of chemical reactions, balancing equations, and oxidation-reduction reactions. Attempt the quiz now and check your score instantly!

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Class 10 Science Chapter 1 Chemical Reactions and Equations MCQs

Chapter 1: Chemical Reactions and Equations

1 / 15

Assertion (A): Following is a balanced chemical equation for the action of steam on iron:

3Fe + 4H₂0 → Fe₃O₄ + 4H₂

Reason (R): The law of conservation of mass holds good for a chemical equation.

Both (A) and (R) are true and (R) is the correct explanation of the assertion.

(A) is false, but (R) is true.

(A) is true, but (R) is false

Both (A) and (R) are true, but (R) is not the correct explanation of the assertion.

2 / 15

Which of the following reaction(s) is an endothermic reaction?

Decomposition of calcium carbonate to form quick lime and carbon dioxide.

Process of respiration

Burning of coal

Decomposition of vegetable matter into compost

3 / 15

Assertion (A): In the reaction: MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂

HCl is getting oxidized while MnO₂ is getting reduced.

Reason (R): The process in which oxygen is added to a substance is called oxidation whereas the process in which oxygen is removed from a substance is called reduction.

Both (A) and (R) are true and (R) is the correct explanation of the assertion.

(A) is false, but (R) is true.

Both (A) and (R) are true, but (R) is not the correct explanation of the assertion.

(A) is true, but (R) is false

4 / 15

Which of the following are exothermic processes?

Reaction of water with quick lime
Dilution of an acid
Evaporation of water
Sublimation of camphor (crystals)

2 and 3

1 and 2

1 and 4

3 and 4

5 / 15

Assertion (A): While equalizing the number of atoms to balance a chemical equation, we alter the formula of the compounds or elements involved in the reaction.

Reason (R): A chemical equation is balanced by making the number of atoms of each element equal on both sides of the arrow.

(A) is true, but (R) is false

(A) is false, but (R) is true.

Both (A) and (R) are true and (R) is the correct explanation of the assertion.

Both (A) and (R) are true, but (R) is not the correct explanation of the assertion.

6 / 15

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by the liberation of heat. This process is called slaking of lime. Which among the following is/are true about slaking of lime?

1. It is an endothermic reaction.

1. It is an exothermic reaction.

1. The pH of the resulting solution will be more than seven.

1. The pH of the resulting solution will be less than seven.

3 and 4

1 and 4

2 and 3

1 and 2

7 / 15

A small amount of copper powder is heated as shown in the figure.

chemical reactions and equations class 10

Which reaction shows the above reaction?

Also See: CBSE Class 10 Half-Yearly Exam 2025 – 7 Last-Minute Study Hacks

CuO + H2 → Cu + H2O

2Cu + O2 → 2CuO

4Cu + O2 → 2Cu2O

None of the above

8 / 15

Assertion (A): A white-washed wall develops a coating of calcium carbonate after a few days.

Reason (R): Calcium oxide on the wall reacts slowly with carbon dioxide in the air.

(A) is true, but (R) is false

Both (A) and (R) are true and (R) is the correct explanation of the assertion.

Both (A) and (R) are true, but (R) is not the correct explanation of the assertion.

(A) is false, but (R) is true.

9 / 15

Sunita takes about 2 g ferrous sulphate crystals in a dry boiling tube and heats the boiling tube over the flame of a burner or spirit lamp as shown in the figure.

chemical reactions and equations questions and answers

The color of crystals after heating is:

Orange

Green

Brown

Black

10 / 15

Identify the endothermic reaction(s) among the following:

1. 6CO₂ + 12H₂O → C₆H₁₂O₆ + 6O₂ + 6H₂O

1. Na₂CO₃ + 2HCl → 2NaCl + CO₂ + H₂O

1. C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O

1. CaCO₃ → CaO + CO₂

Only 2 and 3

Only 1

Only 4

Only 1 and 4

11 / 15

You are given the solution of lead nitrate. In order to obtain a yellow precipitate you should mix with it a solution of ______.

Potassium iodide

Potassium chloride

Potassium sulphide

Potassium nitride

12 / 15

Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during the electrolysis of water is

2:1

4:1

1:1

1:2

13 / 15

Identify the product which represents the solid state in the above reaction.

chemical reactions and equations questions

Barium sulphate

Sodium sulphate

Barium chloride

Sodium chloride

14 / 15

The silver chloride is placed under the sunlight as shown in the figure. The color of silver chloride after some time is:

chemical reactions and equations questions and answer

Green

Grey

Yellow

Black

15 / 15

Which of the following statements about the given reaction are correct?

3Fe + 4H₂O → Fe₃O₄ + 4H₂

1. Iron metal is getting oxidized.

1. Water is getting reduced.

1. Water is acting as a reducing agent.

1. Water is acting as an oxidizing agent.

1, 2, and 3

1, 2, and 4

2 and 4

3 and 4

Your score is

The average score is 57%

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Chemical Reactions and Equations MCQs | Class 10 Science Chapter 1 Quiz

Class 10 Science Chapter 1 Chemical Reactions and Equations MCQs

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Class 10 Science Chapter 1 Chemical Reactions and Equations MCQs

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