Question

D. Choose the correct option in each of the following
1. Which of the following is not a reversible change?
a) The vaporisation of water
b) The melting of iron
The freezing of water
(d) The burning of kerosene
2. Which of the following is not an irreversible change?
(a) The ripening of a mango
(b) The curdling of milk
(c) The condensation of water vapour
(a) The staking of lime
3.in which of the following changes are new substances formed?
al Melting
(b) Sublimation
c) Dissolving
d) Burning
Which of the following involves a fast chemical change?
a) The burning of a matchstick
(b) The rusting of iron
(c) The ripening of a mango
(d) The growth of a plant​

Answer 1

Answer:

1.(d) Burning of kerosene.

2.(c) The condensation of water vapour.

3.(a) Melting.

4.(a) Burning of a matchstick.

Answer 2

Answer:

1. d) burning of kerosene

2. c) The condensation of water vapour

3. d) Burning

4. a) The burning matchstick