Question

D. Choose the correct option,
1. Which of the following is not a reversible change?
(a) The changing of water into steam
(b) The melting of iron
(c) The burning of kerosene
(d) The freezing of water
2. Which of the following is a reversible change?
(a) The burning of wax
(b) The melting of wax
(c) The curdling of milk
(d) The cooking of food
3. During which of the following changes are new substances formed?
(a) Melting
(b) Sublimation
(c) Evaporation
(d) Rusting
4. Rusting takes place in
(a) air-free moisture
(b) moisture-free air
(c) moist air
(d) none of these
5. In which of the following processes is light absorbed?
(a) Sublimation
(b) Burning
(c) Rusting
(d) Photosynthesis​

Answer 1

Answer:

1.(b)

2.(b)

Explanation:

...................

Answer 2

Explanation:

1 burning of kerosene

2. burning of wax

3. melting

4. moist air

5. photosynthesis

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