Which of the following gas molecules has the maximum value of enthalpy of physisorption?

$A$ mixture of gases $O_2$,$H_2$,and $CO$ are taken in a closed vessel containing charcoal. The graph that represents the correct behaviour of pressure with time is

The adsorption of hydrogen by metals is called

The validity of the Freundlich isotherm can be verified by plotting:

The correct option$(s)$ related to adsorption processes is(are):
$A$. Chemisorption results in a unimolecular layer.
$B$. The enthalpy change during physisorption is in the range of $100$ to $140 \ kJ \ mol^{-1}$.
$C$. Chemisorption is an endothermic process.
$D$. Lowering the temperature favors physisorption processes.

For a gas-solid adsorbent system,the adsorption isotherm $\frac{x}{m}=k p^{1/n}$ is applicable,where $n=5$ in the specified case. Point out the correct statement: