Freundlich adsorption isotherm gives a straight line on plotting :-

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: In expensive scientific instruments,silica gel is kept in watch-glasses or in semipermeable membrane bags.
Reason $(R)$: Silica gel adsorbs moisture from air via adsorption,thus protects the instrument from water corrosion (rusting) and/or prevents malfunctioning.
In the light of the above statements,choose the correct answer from the options given below:

For the adsorption of a gas on a solid,the slope of the linear plot of $\log(x/m)$ versus $\log(p)$ is .... ($n$ is an integer).

In the Freundlich adsorption isotherm equation $(x/m) = kp^{1/n}$,the value of $n$ is:

Hydrogen can be adsorbed in the interstitial spaces between $Pd$ atoms. This phenomenon is known as ...........

$A$ mixture of gases $O_2$,$H_2$,and $CO$ are taken in a closed vessel containing charcoal. The graph that represents the correct behaviour of pressure with time is