Common table salt is hygroscopic due to the presence of

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MgCl₂ + CaCl₂

MgO

MgSO₄

MgCO₃

answer is A.

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Detailed Solution

Pure NaCl is not hygroscopic but common table salt is hygroscopic
Reason: Common table salt contains calcium chloride(CaCl₂) and magnesium chloride (MgCl₂) as impurities which are highly deliquescent [hygroscopic] in nature. Thus common table salt is hygroscopic
Note : The ability of a compound to absorb the moisture from the atmosphere is called hygroscopic salt.

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