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1.d
2.b
3.a
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1. Which of the following is not a physical change ?
a. melting of wax.
b. tearing a piece of paper.
c. dissolution of salt in water.
d. digestion of food.✓
2. Which of the following is a chemical change ?
a. breaking of a brick.
b. evaporation of a liquid.
c. burning of a candle.✓
d. moving of a wheel.
3. Chemical changes are:
a. always irreversible.
b. always reversible.
c. mostly irreversible.✓
d. mostly reversible.
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