Chemical Changes Quiz - CBSE Class 7 Science

Free practice quiz: Chemical Changes (CBSE Class 7 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 7 Science practice quiz has 20 multiple-choice questions on Chemical Changes, and 20 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following is a chemical change?

   1. Melting of ice
   2. Rusting of iron
   3. Boiling of water
   4. Mixing sand and salt
   Show answer

   Answer: B. Rusting of iron

   Rusting of iron is a chemical change because new substances are formed during this process.

2. Which gas is commonly produced during a chemical reaction that involves burning?

   1. Hydrogen
   2. Oxygen
   3. Carbon dioxide
   4. Nitrogen
   Show answer

   Answer: C. Carbon dioxide

   Carbon dioxide is a common gas produced during combustion reactions, such as burning fossil fuels.

3. What is the process of tarnishing of silver?

   1. Physical change
   2. Chemical change
   3. Both physical and chemical changes
   4. No change
   Show answer

   Answer: B. Chemical change

   Tarnishing of silver is a chemical change due to a reaction with sulfur compounds, forming silver sulfide.

4. What happens when a compound decomposes?

   1. Forms a mixture
   2. Breaks into simpler substances
   3. Changes in color
   4. Changes state
   Show answer

   Answer: B. Breaks into simpler substances

   Decomposition involves breaking a compound into simpler substances through chemical reactions.

5. Why does baking a cake represent a chemical change?

   1. Only heat is involved
   2. New smell is produced
   3. New substances are formed
   4. Color changes
   Show answer

   Answer: C. New substances are formed

   Baking a cake involves chemical reactions that form new substances, such as when baking soda releases carbon dioxide and interacts with other ingredients.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What is produced when an acid reacts with a base?
2. Which of the following processes is irreversible?
3. How is a precipitate formed?
4. What change occurs when vinegar is added to baking soda?
5. Which of these indicates that a chemical change has occurred?
6. What happens to energy when a chemical change occurs?
7. In which type of reaction is oxygen typically consumed?
8. What is an example of an oxidation reaction?
9. Why is electrolysis considered a chemical change?
10. What characterizes a reduction reaction?
11. What does the law of conservation of mass state in a chemical reaction?
12. What type of reaction is associated with the release of energy?
13. How do catalysts affect chemical reactions?
14. What is the role of an indicator in a chemical reaction?
15. What distinguishes a synthesis reaction?

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