Which one of the following statements is not correct?

Why are powdered substances more effective adsorbents than their crystalline forms?

Give the differences between physical adsorption and chemical adsorption.

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; $\log 2 = 0.3$ )

Which of the following gases is adsorbed to the maximum extent by activated charcoal?

Which of the following statements is not correct?