Which of the following can adsorb the largest volume of hydrogen gas?

The extent of adsorption of a gas on a solid depends on .....

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

In the figure,a straight line is given for the Freundlich Adsorption isotherm equation $(y = mx + c)$,where the equation is $y = 0.3x + 0.7033$. The values of $\frac{1}{n}$ and $\log K$ are respectively:

The following chromatogram was developed by adsorption of compound '$A$' on a $6 \ cm$ $TLC$ glass plate. The retardation factor $(R_f)$ of the compound '$A$' is $.......... \times 10^{-1}$.

Assertion : Physical adsorption of molecules takes place on the surface only.
Reason : In this process,the bonds of the adsorbed molecules are broken.