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Question

Crude common salt becomes damp when kept open in air because:

A
NaCl is hygroscopic in nature
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B
It contains MgCl2 and CaCl2 as impurities which are deliquescent in nature
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C
(a) and (b) both
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D
None
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Solution

The correct option is B It contains MgCl2 and CaCl2 as impurities which are deliquescent in nature
NaCl contains CaCl2 and MgCl2 impurities which are deliquescent i.e. absorbs moisture easily from atmosphere and hence NaCl becomes damp when kept open in air.

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