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What is dead burnt plaster?

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in Chemistry – Class 11 by (148k points)
What is dead burnt plaster?

(a) Hexahydrate calcium sulphate

(b) Hemihydrate calcium sulphate

(c) Anhydrous calcium sulphate

(d) Decahydrate calcium sulphate

The question was posed to me in an interview.

I'm obligated to ask this question of s-Block Elements in division s-Block Elements of Chemistry – Class 11

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Right choice is (c) Anhydrous calcium sulphate

Explanation: When plaster of Paris or calcium sulphate hemihydrate, which is given by the chemical formula CaSO4.1/2H2O is heated about 393 Kelvin, no water of crystallization is left and anhydrous calcium sulphate is formed, it is known as dead burnt plaster.

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