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Plaster of Paris is __________

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Plaster of Paris is __________

(a) Double hydrate of aluminium sulphate

(b) Double hydrate of calcium sulphate

(c) Hemihydrate of calcium sulphate

(d) Hemihydrate of aluminium sulphate

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The correct choice is (c) Hemihydrate of calcium sulphate

The best explanation: Plaster of Paris is hemihydrate of calcium sulphate. On heating finely ground gypsum at a suitable temperature, it loses about 14.7% of its water content and forms plaster of Paris.

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