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Calcium and Its Compounds

Which one of ...

Question

Which one of the following is the number of water molecules that share with two formula unit $C a S O_{4}$ in plaster of Paris ?

A

One

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B

Two

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C

Five

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D

Ten

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Solution

The correct option is A One
The chemical name of plaster of Paris is calcium sulphate hemihydrate because half molecule of water is attached with calcium sulphate. The chemical formula of plaster of Paris is $C a S O 4. \frac{1}{2} H 2 O$ .

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Q. Plaster of Paris is known as calcium sulphate hemihydrate because two formula units of

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