Gypsum on heating gives:

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

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C a S O_{4}

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C a O

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C a S + O_{2}

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Solution

The correct options are
A $C a S O_{4} . \frac{1}{2} H_{2} O$
B $C a S O_{4}$
C $C a O$
Option $(A)$ is correct.
Gypsum on heating gives $C a S O_{4} . \frac{1}{2} H_{2} O$ , $C a S O_{4}$ and $C a O$ .
Gypsum on heating at 120 $^{0} C$ gives plaster of paris ( $C a S O_{4} . \frac{1}{2} H_{2} O$ ).
Gypsum on heating at 200 $^{0} C$ gives anhydrous calcium sulphate ( $C a S O_{4}$ ) which is also known as dead burnt plaster.
On very strong heating, gypsum decomposes into $C a O$ .

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