Which of the following salt becomes plaster of paris on being appropriately hydrated

Which of the following salt becomes plaster of paris on being appropriately hydrated

A
${ZnCO}_{3}$
B
${CaSO}_{4}$
C
${MgSO}_{4}$
D
${CaCO}_{3}$

Solution:

$\underset{Gypsum}{{CaSO}_{4} \cdot 2 H_{2} O} \overset{120 ° C}{\to} {CaSO}_{4} \cdot \frac{1}{2} H_{2} O + 1 \frac{1}{2} H_{2} O Plaster of paris$

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