Which of the following is not a characteristic of chemisorption?

Which of the following statements is correct for the spontaneous adsorption of a gas?

The adsorption of hydrogen by metals is called

The plot of $\log(\frac{x}{m})$ against $\log P$ is a straight line inclined at an angle of $45^{\circ}$. When the pressure is $0.5 \ atm$ and the Freundlich parameter $(K)$ is $10$,the amount of solute adsorbed per gram of adsorbent will be $(\log 5 = 0.699)$ .......... $g$.

Why do physisorption and chemisorption behave differently with a rise in temperature?

Which of the following relationships is correct regarding the Freundlich adsorption isotherm?
$(1)$ $x/m = \text{constant}$ (at high pressure)
$(2)$ $x/m = k \cdot P^{1/n}$ (at intermediate pressure)
$(3)$ $x/m = k \cdot P$ (at low pressure)