Question

Consider the following compounds : FeSO₄ ; CuSO₄ ; CaSO₄ ; Na₂CO₃ The compound having maximum number of water of crystallisation in its crystalline form in one molecule is :

A compound which is prepared from gypsum has the property of hardening when water is mixed in right quantity with it :

In one formula unit of salt 'X', seven molecules of water of crystallisation are present. The salt 'X' is :

What happens when : (write balanced chemical equation)

A few crystals of ferrous sulphate were taken in a dry boiling tube and heated. Tiny water droplets were observed in the tube after some time.