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Question

Which of the following can be categorised as both reversible and 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 D

Both rusting of iron and formation of curd from milk. 


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.
But in general, there is no reaction which is both reversible as well as irreversible.


Chemistry

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