JEE Main 27-Aug-2021 Shift 1 Solved Paper

The chemical formula of gypsum −CaSO4.2H2O, dead burnt plaster −CaSO4 and plaster of Paris −CaSO4.

1

2

H2O.
So, number of water molecules in gypsum, dead burnt plaster and plaster of Paris are 2, 0 and 0.5 respectively.