The charcoal maintained at $100 \ K$ absorbs

Which of the following is not a characteristic of chemisorption?

Consider the graphs $(I)$,$(II)$ and $(III)$. The correct statement related to the graphs is/are:

Arrange the gases $H_2, CH_4, CO_2,$ and $NH_3$ in the order of their volume adsorbed on $1 \ g$ of charcoal at $288 \ K$.

The plot of $\log \frac{x}{m}$ ($y$-axis) and $\log p$ ($x$-axis) is a straight line inclined at an angle of $45^{\circ}$. When the intercept is $\log K = 0.3010$ (where $K = 2$) and pressure is $0.3 \ atm$,calculate the amount of solute in grams adsorbed per gram of adsorbent $\frac{x}{m}$ (given $\log 3 = 0.4771$ and $\log 0.3 = -0.5229$)?

The shape of the adsorption isobar for physical adsorption and the adsorption isobar for chemisorption, respectively, are: