The curve that best describes the adsorption of a gas $(x \, g)$ on $1.0 \, g$ of a solid substrate as a function of pressure $(p)$ at a fixed temperature is

Which of the following adsorption isotherms represents the adsorption of a gas by a solid involving physical adsorption ($P_s =$ saturation pressure)?

Given below are the critical temperatures of some of the gases:

Gas	Critical temperature $(K)$
$He$	$5.2$
$CH_{4}$	$190$
$CO_{2}$	$304.2$
$NH_{3}$	$405.5$

The gas showing least adsorption on a definite amount of charcoal is:

If the value of $\frac{1}{n}$ is equal to $1$ in the Freundlich adsorption isotherm,then $\frac{x}{m} = $ (where $x = $ mass of adsorbate,$m = $ mass of the adsorbent,$p = $ pressure of the gas).

Which among the following is true for chemisorption?

The adsorption of a gas on the surface of a solid is generally an exothermic process because ......