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Question

Commercial common salts become slightly damp on keeping. This is due to the fact that:

A
common salt is hygroscopic
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B
common salt contains some impurities which are hygroscopic
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C
common salt is efflorescent
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D
common salt is crystalline
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Solution

The correct option is C common salt contains some impurities which are hygroscopic
Commercial common salt commonly becomes slightly damp on keeping because common salt contains some impurities like MgCl2 and CaCl2 which are hygroscopic in nature and absorb moisture from the atmosphere.
Hence, option B is correct.

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