$2.0 \ g$ 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?

The charge on colloidal particles is due to

In chromatography,which of the following statements is incorrect for $R_f$?

The correct statement for both the processes of physisorption and chemisorption is

$A$ mixture of substances $A, B, C, D$ is subjected to column chromatography. The degree of adsorption is in the order of $D > B > C > A$. The column is eluted with a suitable solvent. Identify the correct statement with respect to the separation of the mixture.

Amongst the following statements regarding adsorption,those that are valid are :
$(a)$ $\Delta H$ becomes less negative as adsorption proceeds.
$(b)$ On a given adsorbent,ammonia is adsorbed more than nitrogen gas.
$(c)$ On adsorption,the residual force acting along the surface of the adsorbent increases.
$(d)$ With increase in temperature,the equilibrium concentration of adsorbate increases.