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

N a C l

is hygroscopic in nature

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It contains

M g C l_{2}

and

C a C l_{2}

as impurities which are deliquescent in nature

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(a) and (b) both

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None

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Solution

The correct option is B It contains $M g C l_{2}$ and $C a C l_{2}$ as impurities which are deliquescent in nature
$N a C l$ contains $C a C l_{2}$ and $M g C l_{2}$ impurities which are deliquescent i.e. absorbs moisture easily from atmosphere and hence $N a C l$ becomes damp when kept open in air.

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N a C l

N a C l

{C a C l}_{2}

{M g C l}_{2}

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