Find the temperature from the following graph at which the highest amount of a gas is adsorbed. (in $K$)

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

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

Rate of physical adsorption increases with

Which one of the following equations represents the Freundlich adsorption isotherm?

$2.0 \ g$ of activated charcoal is added to $100 \ mL$ of $0.5 \ M$ acetic acid (molar mass $60 \ g \ mol^{-1}$),shaken well and filtered. The concentration of the solution is reduced to $0.4 \ M$. How many grams of acetic acid is adsorbed on charcoal per gram?