Question

ZnA
.
2. Which of the following is an irreversible change?
(a) Melting of ice
(b) Folding of paper
(c) Stretching of a rubber band
(d) Burning of a candle
3. Which of the following changes involves absorption of heat?
(a) Burning of a candle
(b) Burning of fuels
(c) Cooking of food
(d) Burning of crackers
4. Which of the following is not a characteristic of a chemical change?
(a) A chemical change is temporary and can be reversed.
(b) A chemical change involves formation of one or more new substances.
(c) There is a change in the net energy of the system during a chemical change.
(d) There is a change in the mass of the substance undergoing a chemical change.
Which of the following tells you that a chemical change has occurred?
(a) Evolution of gas
(b) Change of colour
(c) Formation of precipitate
(d) All of these
In which of the following processes vapour on cooling changes into a liquid?
(a) Melting
(b) Freezing
(c) Condensation (d) Evaporation​

Answer 1

Answer:

2. c)

3. c)

4. a)

5. d)

6. c)

Explanation:

Answer 2

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