$\begin{array}{1 1}(1) \text{Enthalpy of adsorption is greater than} 100\; kJ\; mol^{−1} \\ (2) \text{ Energy of activation is low.} \\ \text{
(3) Adsorption is monolayer.} \\ \text{
(4) Adsorption increases with increase in
temperature.} \end{array} $
