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Q.

Which of the following cannot be reversed?

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a

Melting of chocolate

b

Freezing of ice

c

Melting of ghee

d

Burning of a candle

answer is D.

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Detailed Solution

Burning of a candle cannot be reversed.
The changes in which only the physical state of the substance changes without the formation of any new product is referred to as physical changes. Mostly, physical changes are reversible in nature in which the original form can be restored. Burning of candle is an irreversible change because it deforms the candle into irregular wax which cannot be restored and the wick cannot be retrieved. The melting of chocolate, freezing of ice and melting of ghee, all show physical changes in the matter of their state which can be restored back.

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