Question

4. When a candle is lighted, the following observations are made:
i. The candle burns
ii. Size of the candle reduces
iii. Wax melts
iv. Melted wax solidifies
Which of the above changes are reversible?
a. ii and iii b. iii and iv c. i and iv d. ii and iv

Answer 1

1. the candle burns...........

Answer 2

Answer:

The answer is option b. Means point iii and iv are reversible..

Because the melting of wax is reversible, It can be again used after it has been melted as it gets back to its original form once the temperature gets lower.

And after wax melts, it solidifies on cooling and can be molten on heating again. Thus we can carry out this change on wax any number of times. These changes are reversible changes.

Explanation:

Hope it helps..

Thank You..