The following chromatogram was developed by adsorption of compound '$A$' on a $6 \ cm$ $TLC$ glass plate. The retardation factor $(R_f)$ of the compound '$A$' is $.......... \times 10^{-1}$.

Which one of the following is an incorrect statement for physisorption?

Correct for physical adsorption is

When $\left( \frac{m}{x} \right)$ is plotted against $\frac{1}{p}$ for the equation $\frac{x}{m} = \frac{ap}{1 + bp}$,we get a straight line. What are the slope and intercept of this line?

$CH_4$ is adsorbed on $1 \ g$ charcoal at $0^{\circ} C$ following the Freundlich adsorption isotherm. $10.0 \ mL$ of $CH_4$ is adsorbed at $100 \ mm$ of $Hg$,whereas $15.0 \ mL$ is adsorbed at $200 \ mm$ of $Hg$. The volume of $CH_4$ adsorbed at $300 \ mm$ of $Hg$ is $10^x \ mL$. The value of $x$ is $....\times 10^{-2}$ (Nearest integer). [Use $\log_{10} 2=0.3010, \log_{10} 3=0.4771$]

What should be taken on the $Y$-axis in the Freundlich adsorption isotherm plot to obtain a straight line?