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Gypsum is the same as plaster of Paris.

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in Chemistry – Class 11 by (148k points)
Gypsum is the same as plaster of Paris.

(a) True

(b) False

I have been asked this question in examination.

My query is from s-Block Elements topic in chapter s-Block Elements of Chemistry – Class 11

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The correct answer is (b) False

Easiest explanation: Plaster of Paris is calcium sulphate hemihydrate and gypsum is calcium sulphate dihydrate. On heating gypsum at 390 Kelvin, it gives plaster of Paris. The chemical formula of gypsum and plaster of Paris is CaSO4.2H2O and CaSO4.1/2H2O respectively.

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