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Q.

Which of these is a reversible change?

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a

Burning of a candle

b

Extinguishing of a candle

c

Melting of wax

d

None of these

answer is C.

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Detailed Solution

The melting of wax is a reversible change.
The changes can either be reversed or cannot be reversed. The burning of a candle and extinguishing of a candle is an irreversible change. The wax is being used up for burning the candle which is burning and cannot be retained again. The candle, after extinguishing, becomes shorter than the original candle's length. So, these changes are irreversible. The wax melts on heating, but once it cools down, it becomes solid again. So, the melting of wax is a reversible change.

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