When crystals of copper sulphate are strongly heated, the residue obtained is

What is gypsum? What happens when gypsum is heated to $373\mathrm{K}$?

State:

The difference between number of molecules in Gypsum and in Plaster of Paris.

Write the chemical formulae of the following:

(a) Common salt  (b) Slaked lime (c) Bleaching powder.

Baking powder is a mixture of baking soda and 

Give one phrase for the following statement:

The property by which certain hydrated salts, when left exposed to atmosphere, lose their water of crystallization and crumble into powder.

Write the chemical formula of the following:

1. Bleaching powder
2. Plaster of Paris

Answer the following:

A calcium compound having odour of chlorine is used to remove yellowish-white clothes in laundries. Name the compound.

Answer the following:

Write the formula of a salt that contains water of crystsllisation.

State one relevant reason for the following:

• Hydrated copper sulphate crystals turn white on heating.