The chemical formula of plaster of paris is ${\mathrm{CaSO}}_4.\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.{\mathrm{H}}_2\mathrm{O}$. 

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

Write the chemical formulae of the following:

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

Write the chemical formula of the following:

1. Bleaching powder
2. Plaster of Paris

Answer the following:

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

State:

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

Baking powder is a mixture of baking soda and 

What is the chemical name of baking soda? How is it produced? Give chemical equation. 

Answer the following:

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