$A$ plot of $\log (x / m)$ versus $\log (P)$ for the adsorption of a gas on a solid gives a straight line with a slope of:

The adsorbent used in adsorption chromatography is/are:
$A$. silica gel
$B$. alumina
$C$. quick lime
$D$. magnesia
Choose the most appropriate answer from the options given below:

Which of the following statements is incorrect?

Which statements among the following are correct?
$(i)$ Freundlich isotherm fails at high pressure of the gas.
$(ii)$ $\Delta H < 0$ for both physical and chemical adsorption.
$(iii)$ Physical adsorption is non-selective.
$(iv)$ Chemical adsorption is reversible,whereas physical adsorption is irreversible.

Which of the following statements is true for adsorption?

Identify the gas adsorbed by a solid to the largest extent at their respective critical temperatures.