Question

Table salt turns moist on exposure to air why?

Answer 1

Table salt turns moist on exposure to air because of the presence of impurities like magnesium chloride and calcium chloride which are deliquescent
Sodium chloride itself is not deliquescent.

Answer 2

Table salt turns moist on exposure to air because of the presence of impurities like magnesium chloride and calcium chloride which are deliquescent