Give the uses of Gypsum.

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Q. Give the uses of Gypsum.

Puducherry TnboardTamil Nadu HSC First Year (DGE) Board 2026Subjective· 3mImportance★★★★★est

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The question asks for the uses of gypsum, CaSO4·2H2O.

Gypsum is used mainly to make plaster of Paris and cement, and also as a fertiliser, in surgical casts, and as chalk.

Gypsum is calcium sulphate dihydrate, CaSO4·2H2O. Its important uses include:

Manufacture of plaster of Paris: on partial heating (~120-150°C), gypsum loses part of its water to form plaster of Paris, CaSO4·(1/2)H2O.
Cement industry: a small amount of gypsum is added to cement to slow down (regulate) its rate of setting.
Fertiliser / soil conditioner: it supplies calcium and sulphur and improves the texture of alkaline soils.
Manufacture of ammonium sulphate (a nitrogenous fertiliser).
Blackboard chalk and as a filler in paints and paper. …

Q.Give the uses of Gypsum.