The following statements relate to the adsorption of gases on a solid surface. Identify the incorrect statement among them :

Question

$\begin{array}{1 1} \text{Enthalpy of absorption } \\ \text{Enthalpy of absorption is negative } \\ \text{On adsorption, the residual forces on the surface are increased} \\\text{On adsorption decrease in surface energy appears as heat} \end{array}$