The chemical formula of plaster of paris is ........

Explanation:

The chemical name of plaster of Paris is calcium sulphate hemihydrate because half molecule of water is attached with calcium sulphate.

• The chemical formula of plaster of Paris is CaSO4.1/2H2O.

• Plaster of paris is a white powder.

• It is used for many purposes like making toys,immobilizing the fractured bones.

• The compound plaster of Paris is prepared by heating gypsum at 120 degree celcius and is better known as calcium sulfate hemihydrate.

Hence option 4th is correct.