Discussion Forum



1)

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


A) The critical temperature of ethane and nitrogen are 563 K and 126 K. respectively. The absorption of ethane will be more than that of nitrogen of the same amount of activated charcoal at a given temperature

B) Cloud is an emulsion type of colloid in which liquid is dispersed phase and gas is dispersion medium

C) Adsorption is accompanied by decreases in enthalpy and decreases in entropy of the system

D) Brownian motion of colloidal particles does not depend on the size of the particles but depends on the viscosity of the solution

Answer:

Option A,C

Explanation:

(b) Higher the critical temperature, greater the extent of adsorption

(b)  P(s)         +  Q (g)              → PQ(s)

  adsorbent         Adsorbate

  As gaseous adsorbate is adsorbed on a solid surface, entropy decreases. Also formation of the bond between P and Q results in release of energy, hence ΔH<0