(C) Plaster of Paris is $CaSO_4 \cdot \frac{1}{2}H_2O$. When it is mixed with water,it undergoes hydration to form a hard mass of gypsum $(CaSO_4 \cdo

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(C) Plaster of Paris is $CaSO_4 \cdot \frac{1}{2}H_2O$. When it is mixed with water,it undergoes hydration to form a hard mass of gypsum $(CaSO_4 \cdot 2H_2O)$. The reaction is: $CaSO_4 \cdot \frac{1}{2}H_2O + \frac{3}{2}H_2O \rightarrow CaSO_4 \cdot 2H_2O$. Thus,the hardening process involves combining with water.