The chemical name of Plaster of Paris is calcium _________ hemihydrate.

phosphate

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nitrate

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carbonate

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sulphate

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Solution

The correct option is D sulphate

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Why calcium sulphate hemihydrate is called plaster of Paris?

Column (I)	Column (II)
(1) Bleaching powder	(a) Sodium bicarbonate
(2) Baking soda	(b) Sodium carbonate
(3) Washing soda	(c) Calcium oxychloride
(4) Plaster of Paris	(d) Calcium sulphate hemihydrate

C a S O_{4}

H_{2} O

(a) What is plaster of Paris? Write the chemical formula of plaster of Paris.

(b) How is plaster of Paris prepared? Write the chemical equation of the reaction involved.

(d) State two important uses of plaster of Paris.

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