When plaster of paris comes in contact with water it sets into a hard mass. The composition of the hard mass is:

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

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C a S O_{4} . C a (O H)_{2}

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

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C a S O_{4} .2 C a (O H)_{2}

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Solution

The correct option is C $C a S O_{4} .2 H_{2} O$
When plaster of paris comes in contact with water it sets into a hard mass which is called gypsum. Its composition is $C a S O_{4} .2 H_{2} O$

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