Which is not a colligative property in the following?

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Freezing point depression

Boiling point elevation

Osmotic pressure

Vapour pressure

answer is D.

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Detailed Solution

Vapour pressure is not a colligative property.

Colligative properties depend on the number of particles in a solution, not their type. The options listed are:

Osmotic pressure - This is a colligative property.
Elevation in boiling point - This is a colligative property.
Vapour pressure - This is not a colligative property. It depends on the nature of the solvent, not just the number of solute particles.
Depression in freezing point - This is a colligative property.

So, the correct answer is C. Vapour pressure, as it is not a colligative property.

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