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What is Plaster of Paris chemically? How is it prepared? List its two important uses.

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What is Plaster of Paris chemically? How is it prepared? List its two important uses.

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Calcium sulphate hemihydrate. 

It is prepared by heating gypsum at 373 K.

(i) It is used to prepare chalks. 

(ii) It is used to make casts and moulds

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