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Plaster of paris is chemically (DNB Dec 2009)
|A||Calcium sulphate "(gypsum) CaS04 2 H2 O|
|D||Hemihydrate calcium sulphate|
Hemihydrate calcium sulphate
Plaster of paris is hemihydrate calcium sulphate which on setting (after immersing in water) become calcium sulphate double hydrated also called gypsum, this is an exothermic reaction.