Chemistry - Complete s-block Question with Solution | TestHub

If we mix plaster of Paris$(\mathrm{C}\mathrm{a}\mathrm{S}{\mathrm{O}}_4.\frac{1}{2}{\mathrm{H}}_2\mathrm{O})$with water a hard substance will be formed, gypsum.Plaster of Paris is a slightly soluble solid which reacts exothermically with water to produce gypsum$(\mathrm{C}\mathrm{a}\mathrm{S}{\mathrm{O}}_4.2{\mathrm{H}}_2\mathrm{O})$.
$\underset{\text{Plaster}\text{of}\text{Paris}}{{\text{2CaSO}}_{\text{4}}\cdot \frac{\text{1}}{\text{2}}{\text{H}}_{\text{2}}\text{O}}\text{+}{\text{3H}}_{\text{2}}\text{O}\to \underset{\text{Gypsum}\left(\text{Hard mass}\right)}{{\text{2CaSO}}_{\text{4}}\cdot {\text{2H}}_{\text{2}}\text{O}}$