Commercial common salt becomes slightly damp on keeping. This is due to the fact that-

Options

A. Common salt is hygroscopic
B. Common salt contains some impurity which is hygroscopic
C. Salt is efflorescent
D. Salt is crystalline

Answer

B

Explanation

Commerical comment salt commonly becomes slightly damp on keeping because common salt contains some impurity `MgCl_(2)` and `CaCl_(2)` which is hygroscopic in nature and absorbs moisture from the atmosphere.