Above figure represents Vapour pressure versus Temperature graphs of 2 pure volatile liquids and a solution formed by the 2 liquids. (i) Which curve represents the solution? (ii) Which curve represents the liquid with the strongest intermolecular forces of attraction?

The vapour pressure of a solution containing two volatile liquids is always intermediate between the vapour pressures of the two pure components at a given temperature. In the graph, curve A represents the liquid with the highest vapour pressure (weakest intermolecular forces), curve C represents the liquid with the lowest vapour pressure (strongest intermolecular forces), and curve B represents the solution formed by these two liquids.

Therefore, (i) curve B represents the solution, and (ii) curve C represents the liquid with the strongest intermolecular forces of attraction.

Answer: (i) B (ii) C