Common table salt is hygroscopic due to the presence of

Pure NaCl is not hygroscopic but common table salt is hygroscopicReason: 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 hygroscopicNote : The ability of a compound to absorb the moisture from the atmosphere is called hygroscopic salt.