Which of the following statements is true for adsorption?

In the Freundlich isotherm $\frac{x}{m}=k p^{\frac{1}{n}}$ plot of $\log \frac{x}{m}$ vs $\log p$, the intercept is (where, $x$, $m$, $p$ and $k$ are mass of the gas, mass of adsorbent, pressure and constant which depend on the nature of the adsorbent, respectively)

In the process of adsorption,which of the following values is less than zero?

The charge on colloidal particles is due to

$A$ particular adsorption process has the following characteristics: $(i)$ It arises due to van der Waals forces and $(ii)$ it is reversible. Identify the correct statement that describes the above adsorption process.

Freundlich adsorption isotherm gives a straight line on plotting :-