Gypsum, $C a S O_{4} .2 H_{2} O$ , on heating to about $120^{0} C$ forms a compound which has the chemical composition represented by

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

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C a S O_{4}

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

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2 C a S O_{4} .3 H_{2} O

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Solution

The correct option is A $2 C a S O_{4} . H_{2} O$
Gypsum, $C a S O_{4} .2 H_{2} O$ , on heating to about $120^{0} C$ forms a compound which has the chemical composition represented by $2 C a S O_{4} . H_{2} O .$ or $C a S O_{4} . \frac{1}{2} H_{2} O .$

$2 (C a S O_{4} .2 H_{2} O) 120^{o} - ------ \to D e h y d r a t i o n 2 C a S O_{4} . H_{2} O + 3 H_{2} O$
Gypsum Plaster of Paris

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