Activated charcoal is used to remove colouring matter from pure substances. It works by

For Freundlich adsorption isotherm,a graph of $\log (x / m)$ vs $\log (p)$ gives a straight line. The slope of the line and its $Y$-axis intercept respectively are

What will be the effect of an increase in temperature on physical adsorption?

If the adsorbate is held on a surface by weak Van der Waals forces,the adsorption process is called:

Four gases $A$,$B$,$C$,and $D$ have critical temperatures $5.3 \ K$,$33.2 \ K$,$126.0 \ K$,and $154.3 \ K$ respectively. For their adsorption on a fixed amount of charcoal,the correct order is:

Assertion $(A)$: Adsorption is an exothermic process.
Reason $(R)$: Physisorption of a gas on a solid surface is normally reversible.