Which of the following is not a colligative property?

Options

A. Depression in freezing point
B. Elevation in boiling point
C. Osmotic pressure
D. Modification of refractive index

Answer

D

Explanation

The properties of ideal solutions which depend only on the number of particles of the solute (molecules or ions) dissolved in a definite amount of the solvent and do not depend on the nature of solute are called colligative properties. The important colligative properties are: (i) Relative lowering of vapour pressure. (ii) Osmotic pressure (iii)Elevation in boiling point (iv)Depression in freezing point Hence, modification of refractive index is not a colligative property.