Which of the following is used for the adsorption of moisture?

Which of the following statements is false during the adsorption of gas molecules on a metal surface?

In Freundlich adsorption,the amount of gas adsorbed is proportional to pressure $P$ as

Adsorption of a gas on solids follows Freundlich adsorption isotherm. The graph drawn between $\log \frac{x}{m}$ (on y-axis) and $\log p$ (on x-axis) is a straight line with slope equal to $3$ and intercept equal to $0.30$. What is the value of $\frac{x}{m}$ at a pressure of $2 \ atm$?
(Given; $\log 2 = 0.3$ )

According to the Langmuir adsorption isotherm,which of the following plots is a straight line?

$50 \ mL$ of $1 \ M$ oxalic acid is shaken with $0.5 \ g$ of wood charcoal. The final concentration of the solution after adsorption is $0.5 \ M$. The amount of oxalic acid adsorbed per $g$ of charcoal is ....... $g$.