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NaCl is not hygroscopic but impurities like MgSO4 , CaSO4, MgCl2 and CaCl2, present in it are hygroscopic and absorb moisture from air.
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NaCl is not hygroscopic but impurities like MgSO4 , CaSO4, MgCl2 and CaCl2, present in it are hygroscopic and absorb moisture from air.