Which of the following changes is reversible?

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A Melting of wax
B Burning of paper
C Rusting of iron
D Cooking of food

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Answer: A. Melting of wax

Melting of wax is a reversible change because, when cooled, the wax solidifies again. In contrast, burning, rusting, and cooking are irreversible processes.

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Which of the following changes is reversible?

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