What is plaster of paris ? How is it prepared ? Give its any two important uses.

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Solution

Plaster of paris is $C a S O_{4} \frac{1}{2} H_{2} O$ . It is prepared by heating gypsum at 373K
$C a S O_{4} .2 H_{2} O H e a t - -- \to 373 k C a S O_{4} \frac{1}{2} H_{2} O + \frac{3}{2} H_{2} O$
Uses:
• It is used for manufacture of statues
• It is used for filling gaps before white washing

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