The substance used to decolourise and purify oils is

When temperature is increased,what happens to the extent of adsorption in physisorption?

Which of the following curves is in accordance with the Freundlich adsorption isotherm?

Two compounds $I$ and $II$ are eluted by column chromatography (adsorption of $I > II$). Which one of the following is a correct statement?

$50 \ mL$ 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 ....... $g$.

Which of the following is true for spontaneous adsorption of $H_2$ gas without dissociation on a solid surface?