Which of the following is both reversible as well as irreversible change?

Formation of curd from milk.

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Melting of wax on burning of a candle.

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There is no such case possible in general.

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Both melting of wax and formation of curd from milk.

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Solution

The correct option is C There is no such case possible in general.
Formation of curd from milk is an irreversible change, as milk cannot be obtained back from curd.
Melting of wax in a candle is a reversible change, as wax can be, solidified and can be converted back to a candle.
In general, changes around us are either reversible or irreversible.

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