For the phenomenon of adsorption, the correct statement/s among the...

Options

1. AAccording to Freundlich model, mass of $\mathrm{N}_2$ gas adsorbed per g of silica surface will increase with temperature of adsorption
2. BIf S is the surface area of an adsorbent, and ' A ', ' m ' and ' M ' are the cross-sectional area, mass adsorbed and molar mass of the adsorbate respectively, then $S=\left(\frac{m}{M}\right) A N_A$ ( $\mathrm{N}_{\mathrm{A}}$-Avogadro's number)
3. CThe number of gas molecules physisorbed on unit mass of an adsorbent will be the same for two different gases at the same temperature.
4. DAdsorption of $\mathrm{H}_2$ on Ni surface with $\mathrm{E}_{\mathrm{a}}=96 \mathrm{~kJ} \mathrm{~mol}^{-1}$ can be termed as chemisorption