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Q. Setting of plaster of Paris involves

The s-Block Elements

Solution:

Setting of plaster of Paris involves hydration to yield dihydrate.
$\underset{\text{Plaster of Paris}}{CaSO_{4}.\frac{1}{2}H_{2}O} \xrightarrow{ H_2O } \underset{\text{Gypsum}}{CaSO_4.2H_2O} $