Van Laar equation deals with the activity co-efficients in

A. Binary solutions

B. Ternary solutions

C. Azeotropic mixture only

D. None of these

Answer: Option A

Solution(By Examveda Team)

Van Laar equation is an activity based model developed by Van Laar during 1910-1913. Which will be very useful during vapor-liquid equilibrium calculations and the equations for a binary mixture are given as :
$$\eqalign{ & ln{\gamma _1} = \frac{{AX_2^2}}{{{{\left( {\frac{{A{X_1}}}{B} + {X_2}} \right)}^2}}} \cr & ln{\gamma _2} = \frac{{BX_1^2}}{{{{\left( {\frac{{B{X_2}}}{A} + {X_1}} \right)}^2}}} \cr} $$