Determine the value of $\text{'}\mathrm{n}\text{'}$ in Freundlich adsorption isotherm in the case of high pressure.

The mass of gas adsorbed, $\mathrm{x}$, per unit mass of adsorbate, $\mathrm{m}$, was measured at various pressures, $\mathrm{p}.$A graph between $\log \frac{\mathrm{x}}{\mathrm{m}}$ and $\log \mathrm{p}$ gives a straight line with slope equal to $2$ and the intercept equal to $0.4771$. The value of $\frac{\mathrm{x}}{\mathrm{m}}$ at a pressure of $4 \mathrm{atm}$ is :

(Given $\log 3=0.4771$)

Given:



On the basis of data given above, predict which of the following gases shows the least adsorption on a definite amount of charcoal?