The correct statement (s) about surface properties is (are)

Options

A. Cloud is an emulsion type of colloidal in which liquid is dispersed phase and gas is dispersion medium
B. Adsorption is accompained by decrease in enthalpy and decrease in entropy of the system
C. Brownian motion of colloidal particles does not depend on the size of the particles but depends on viscosity of the solution
D. The critical temperature of ethane and nitrogen and 563K and 126 K, respectively . The adsorption of ethane will be more than of nitrogen on same amount of activated charcoal at a given temperature

Answer

B, D

Explanation

Adsorption is invariabley exothermic i.e., `DeltaH=-` ve more it is spontaneous process and all the three thermodynamic parameters `DeltaG, DeltaH, DeltaS` are negative.
Easily liquefiable gases with high critical temperature show high degree of adsorption . Then, adsorption of ethane will be more than that of nitrogen on same amount of activated charcoal at a given temperature.