Question

The diagram given below is a vapour pressure-composition diagram for a binary solution of A and B.

In the solution, $A—B$ interactions are

• A. similar to A—A and B—B interactions
• B. greater than A—A and B— B interactions
• C. smaller than A—A and B— B interactions
• D. unpredictable

Answer 1

Answer: (C)

The given figure is showing positive deviation from Raoult's law.

$P_A>P_A^{\circ }{X}_A$

Thus $A-B$ attractive force should be weaker than $A-A$ and $B-B$ attractive forces.