In Freundlich adsorption,the amount of gas adsorbed is proportional to pressure $P$ as

For the adsorption of hydrogen on platinum,the activation energy is $30 \ kJ \ mol^{-1}$ and for the adsorption of hydrogen on nickel,the activation energy is $41.4 \ kJ \ mol^{-1}$. The logarithm of the ratio of the rates of chemisorption on equal areas of the metals at $300 \ K$ is $........$ (Nearest integer). Given: $\ln 10 = 2.3$,$R = 8.3 \ J \ K^{-1} \ mol^{-1}$.

Assertion $(A)$: van der Waals' forces are responsible for chemisorption.
Reason $(R)$: High temperature is favourable for chemisorption.
The correct answer is

How many layers are adsorbed in chemical adsorption (chemisorption)?

Which among the following gases is adsorbed to a greater extent at similar conditions of temperature and pressure if the adsorbent remains same?

Sticking of one substance at the surface of another is called: