Common salt is hygroscoic because of the presence of the
following impurities :

(1) CaSO4 and MgSO4

(2) CaCl2 and MgCl2

(3) CaBr2 and MgBr2

(4) CaCO3 and MgCO3

Answer Posted / guest

( 2 ) CaCl2 and MgCl2

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