Why does common salt become moist in rainy season?

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Solution

Dear Student

Common Salt (NaCl) has some impurities e.g., MgCl₂. Magnesium chloride is deliquescent.
So, on exposure to air, especially during rainy season, it absorbs moisture and become moist.
However, NaCl is not deliquescent. Moist nature of common salt is only due to MgCl₂ present as an impurity.

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