Answer:
Pure NaCI is not hygroscopic but
table salt is impure NaCl containing impurities of\[M{{g}_{2}}S{{O}_{4}},\,\,CaS{{O}_{4}},\,\,MgC{{l}_{2}}\]
and \[CaC{{l}_{2}}\]. All of these being hygroscopic absorb moisture from air
in rainy season. As a result, table salt gets wet.
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