The colligative property is not represented by (AllMS 2013)

Colligative properties are defined as properties of dilute solutions of non-volatile solutes whose values depend upon the concentration and number of solute particles in the solution but not on the individual identity of the solute. Various colligative properties are: (i) Relative lowering of vapour pressure (ii) Elevation in boiling point (iii) Depression in freezing point (iv) Osmotic pressure So, optical activity is not a colligative property.