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

Which of the following orders is correct?

In the Freundlich adsorption isotherm,the value of $x/m$ does not increase rapidly with an increase in the value of $p$,because .....

Correct for physical adsorption is

Adsorption of a gas follows the Freundlich adsorption isotherm. $x$ is the mass of the gas adsorbed on mass $m$ of the adsorbent. The plot of $\log \frac{x}{m}$ versus $\log p$ is shown in the given graph. $\frac{x}{m}$ is proportional to:

The Freundlich adsorption isotherm gives a straight line on plotting: