Name a compound which hardens on wetting with water.

Calcium sulphate decahydrates

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Calcium sulphur hemihydrates

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Calcium sulphate

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Hydrated calcium sulphate

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Solution

The correct option is C Calcium sulphur hemihydrates
The calcium compound that hardens on wetting with water is commonly known as Plaster of Paris (POP), chemically known as calcium sulphate hemihydrate having the formula $C a S O_{4} .1 / 2 H_{2} O$

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