Which of the following changes can be reversed?

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Burning candle

Hardening of cement

Melting of ghee

Cutting trees

answer is C.

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Detailed Solution

Melting of ghee can 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. Melting of ghee is a reversible process because ghee melts into a liquid state and then returns to its original state after cooling. Burning of the candle deforms the candle into irregular wax which cannot be restored and the wick cannot be retrieved. Once the cement hardens, it cannot be converted back to liquid form. When the trees are cut it's impossible to plant them back naturally in the soil.

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