Physical adsorption is inversely proportional to the

Which of the following is not correct about Freundlich adsorption isotherm?

Plot of $\log \left( \frac{x}{m} \right)$ against $\log P$ is a straight line inclined at an angle of $45^o$. When the pressure is $0.5 \ atm$ and Freundlich parameter,$k$ is $10$,the amount of solute adsorbed per gram of adsorbent will be ...... $g$ $(\log 5 = 0.6990)$

Which of the following is correct for Freundlich adsorption isotherm?

What is the effect of pressure on the extent of adsorption?

The colloidal sol of $SnCl_4$ prefers the adsorption of which ion in the presence of excess $HCl$?