Mortar is a mixture of

Question

$\begin{array}{1 1} \text{Plaster of pairs + silica } \\ \text{Slaked lime + plaster of paris + $H_2O$ } \\ \text{$CaCO_3$+ silica +H_2O } \\ \text{Slaked lime + sand +$H_2O$} \end{array} $