Which one of the following is correct for the adsorption of a gas at a given temperature on a solid surface?

Match List I with List II :
    List-I                                  List-II

Example of colloids            Classification
(a) Cheese                   (i) dispersion of liquid in liquid
(b) Pumice stone         (ii) dispersion of liquid in gas
(c) Hair cream             (iii) dispersion of gas in solid
(d) Cloud                     (iv) dispersion of liquid in solid

Choose the most appropriate answer from the options given below

In Freundlich adsorption isotherm, slope of $\mathrm{AB}$ line is:

For coagulation of 50 mL of a sol, 10 mL of 0.5M Cl^- ion solution is required. What is the coagulating value of ${\mathrm{Cl}}^{-}$ ion solution (Nearest integer)