Question

Two liquids X and Y boil at 110°C and 130°C respectively. Which one of them has higher vapour pressure at 50°C?

Answer 1

The liquid X, which boils at 110°C, has a higher vapour pressure at 50°C than liquid Y, which boils at 130°C. This is because a lower boiling point indicates higher vapour pressure at a given temperature; a substance that boils at a lower temperature requires less heat to reach the vapour phase.