Question

In the graph plotted between vapour pressure $(V.P.)$ and temperature $(T)$,

• A. $PQ$ is the curve for solvent, $XY$ is the curve of solution and $\Delta T$ is depression in freezing point
• B. $PQ$ is the curve for solution, $XY$ is the curve for solvent and $\Delta T$ is elevation in boiling point
• C. $PQ$ is the curve for solvent, $XY$ is the curve for solution and $\Delta T$ is molal elevation in boiling point
• D. $PQ$ is the curve for solvent, $XY$ is the curve for solution and $\Delta T$ is elevation in boiling point

Answer 1

Answer: (D)

$PQ$ corresponds to increase in vapour pressure of solvent with temperature and $XY$ corresponds to increase in vapour pressure of solution with temperature. $\Delta T$ is the elevation in boiling point of a solution.