Give the chemical formula of calcium sulphate hemihydrate.

C a S O_{4} .2 H_{2} O

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C a S O_{4} . \frac{1}{2} H_{2} O

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C a S O_{4} .10 H_{2} O

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C a S O_{4} . H_{2} O

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Solution

The correct option is B $C a S O_{4} . \frac{1}{2} H_{2} O$
Calcium sulphate hemihydrate has chemical formula $C a S O_{4} . \frac{1}{2} H_{2} O$ .

One molecule of $C a S O_{4}$ contains $\frac{1}{2}$ molecule of water.

Hence, the option $(B)$ is the correct answer.

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