Gypsum CaSO4⋅2H2O on heating to about 120° C form a compound which has the chemical composition represented by

A
${CaSO}_{4}$
B
$2 {CaSO}_{4} \cdot H_{2} O$
C
${CaSO}_{4} \cdot H_{2} O$
D
$2 {CaSO}_{4} \cdot 3 H_{2} O$

Solution:

$\underset{Gypsurn}{2 ({CaSO}_{4}} \cdot 2 H_{2} O) \underset{Dehydration}{\overset{120^{o} C}{\to}} \underset{Plaster of paris}{2 {CaSO}_{4} \cdot H_{2} O} + 3 H_{2} O .$

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