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!

Key Benefits:

  • 📚 Based on the latest CBSE syllabus & NCERT book
  • Instant answers & explanations for each question
  • 🏆 Leaderboard feature to compete with friends
  • 🎯 Covers important questions for board exams

Class 10 Science Chapter 1 Chemical Reactions and Equations MCQs

Chapter 1: Chemical Reactions and Equations

1 / 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.

2 / 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

3 / 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.

4 / 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.

5 / 15

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

6 / 15

Which of the following are exothermic processes?

  1. Reaction of water with quick lime
  2. Dilution of an acid
  3. Evaporation of water
  4. Sublimation of camphor (crystals)

7 / 15

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

chemical reactions and equations questions

8 / 15

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

9 / 15

10 / 15

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

11 / 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.

12 / 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:

13 / 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?

14 / 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.

15 / 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 

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The average score is 57%

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