Plaster of paris in contact with water sets to a hard mass whose composition is :

C a S O_{4}

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

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

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

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Solution

The correct option is C $C a S O_{4} .2 H_{2} O$
On mixing with water, plaster of paris takes up water of crystallization to form orthorhombic calcium sulphate dihydrate. This sets to a hard mass which is monoclinic calcium sulphate dihydrate or gypsum. This is the final product of setting of plaster of paris. Its composition is $C a S O_{4} \cdot 2 H_{2} O$ .

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C a S O_{4}

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Plaster of Paris is prepared by heating one of the following to a temperature of $100^{o} C$ . This is :

(a) $C a S O_{3} 2 H_{2} O$

(b) $C a C l_{2} 2 H_{2} O$

(d) $C a S O_{4} .2 H_{2} O$

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