Physical and Chemical Changes Quiz - ICSE Class 6 Chemistry

Free practice quiz: Physical and Chemical Changes (ICSE Class 6 Chemistry). 51 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 6 Chemistry practice quiz has 51 multiple-choice questions on Physical and Chemical Changes, and 51 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 an example of a physical change where no new substance is formed?

   1. Burning of wood
   2. Rusting of iron
   3. Melting of ice
   4. Digestion of food
   Show answer

   Answer: C. Melting of ice

   Melting of ice is a physical change because water changes its state from solid to liquid, but its chemical composition (H2O) remains the same. Burning wood, rusting of iron, and digestion of food involve the formation of new substances.

2. Which of the following changes results in the formation of a gas and a new substance?

   1. Melting of wax
   2. Freezing of water
   3. Dissolving sugar in water
   4. Burning of a candle
   Show answer

   Answer: D. Burning of a candle

   Burning a candle is a chemical change where the wax reacts with oxygen, producing new substances like carbon dioxide, water vapor, and ash, and releasing heat and light. It can also produce smoke (fine particles). Melting of wax, freezing of water, and dissolving sugar are physical changes.

3. Which of the following is an example of a change in which no new substance is formed, but the appearance changes?

   1. Rusting of iron
   2. Cooking an egg
   3. Shredding paper
   4. Digestion of food
   Show answer

   Answer: C. Shredding paper

   Shredding paper is a physical change. The paper is cut into smaller pieces, changing its form and appearance, but it remains paper (cellulose). Rusting, cooking, and digestion involve chemical reactions and the formation of new substances.

4. The change in the state of matter from solid to liquid is called melting. This is a:

   1. Chemical change
   2. Physical change
   3. Irreversible change
   4. Combustion
   Show answer

   Answer: B. Physical change

   Melting is a physical change because the substance changes its state from solid to liquid but its chemical composition remains the same. For example, ice (solid water) melts into liquid water, and both are H2O.

5. Which of the following is an example of a change that occurs due to heat and is chemical in nature?

   1. Melting of ice
   2. Boiling water
   3. Burning of paper
   4. Evaporation of water
   Show answer

   Answer: C. Burning of paper

   Burning of paper is a chemical change that involves combustion, producing new substances like ash, carbon dioxide, and water vapor, along with heat and light. Melting, boiling, and evaporation are physical changes.

More questions in this quiz

Answers and explanations are in the full quiz.

1. A chemical change is characterized by:
2. When iron is heated in the presence of sulfur, iron sulfide is formed. This is an example of:
3. Which of the following is NOT a characteristic of a physical change?
4. Photosynthesis in plants is considered a chemical change because:
5. When an electric current is passed through water, it decomposes into hydrogen and oxygen gases. This is a:
6. Which of these is an example of a reversible physical change?
7. Rusting of iron involves a chemical reaction between iron, oxygen, and:
8. Dissolving salt in water is primarily considered a:
9. The process of sublimation, where a solid directly changes into a gas, is a:
10. When a banana ripens, it undergoes a:
11. Which action demonstrates a chemical change involving heat production?
12. Condensation of steam into water is a:
13. The process of digestion of food in our body is best described as:
14. Which of the following is an example of a change that produces sound?
15. When baking soda is heated, it decomposes to form sodium carbonate, water, and carbon dioxide gas. This is an example of:
16. The change in color when an apple is cut and left exposed to air is due to:
17. Which of the following is a chemical change involving the absorption of heat?
18. When copper is exposed to moist air for a long time, it develops a greenish coating. This process is:
19. The process of crystallization from a solution is generally considered a:
20. Which of the following changes involves a change in the chemical bonds of the substance?
21. When lime water (calcium hydroxide solution) is exposed to air, a white precipitate of calcium carbonate forms. This is a:
22. Which statement accurately describes a physical change?
23. The process of tarnishing of silver is a type of:
24. Which of the following is NOT an indicator of a chemical change?
25. When carbon dioxide gas is bubbled through lime water, the lime water turns milky due to the formation of:
26. The process of digestion of starch into simpler sugars by enzymes is a:
27. Which of the following is an example of a chemical change that is slow and often undesirable?
28. Which of the following is a chemical change that produces a gas?
29. The process of fermentation, like making bread or yogurt, is an example of:
30. Which of the following changes is irreversible?
31. When charcoal is heated strongly in the presence of air, it burns to produce carbon dioxide gas. This is:
32. The process of sublimation of iodine crystals is an example of:
33. Which of the following involves the formation of a precipitate?
34. The change that occurs when a log of wood is chopped into smaller pieces is:
35. Which of the following is a chemical change that involves gas evolution and a color change?
36. The process of beating egg whites until they form stiff peaks is an example of:
37. When litmus paper is dipped in lemon juice, it turns red. This indicates:
38. The process of drying clothes in the sun is primarily:
39. Which of the following is an example of a chemical change that involves a change in smell?
40. When iron filings are mixed with sulfur powder and heated, they form iron sulfide. This new substance has properties that are:
41. The process of making butter from milk is primarily:
42. Which of the following changes would be classified as a chemical reaction leading to a new substance?
43. When a candle burns, the wax melts and vaporizes, and then reacts with oxygen. This is:
44. The formation of curd from milk is a:
45. Which of the following is a characteristic of a chemical change that is NOT always true for a physical change?
46. When iron is hammered into a sheet, it undergoes a:

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