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Question

Which of the following is both a reversible and an irreversible change?



A

Formation of curd from milk.

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B

Rusting of iron

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C

There is no such case possible in general.

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D

Both rusting of iron and formation of curd from milk. 

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Solution

The correct option is B

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 converted back to a candle.
But in general, there is no reaction which is both reversible as well as irreversible.


Chemistry

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