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Question

On heating gypsum at 373 K, we obtain:


A

Calcium sulphate hemihydrate

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B

Baking soda

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C

Washing soda

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D

Calcium sulphate dihydrate

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Solution

The correct option is A

Calcium sulphate hemihydrate


On heating gypsum it loses one and a half molecules of water and forms calcium sulphate hemihydrate also known as plaster of Paris


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