What is the value of the slope in the Freundlich adsorption isotherm plot of $\log \frac{x}{m}$ against $\log C$?

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)

Which of the following statements is true for physical adsorption?

Why is chemisorption referred to as activated adsorption?

During adsorption,the $\Delta H$ is negative and the magnitude of this negative value

In chromatography,which of the following statements is incorrect for $R_f$?