A) Refractive index
B) Lowering of vapour pressure
C) Depression in freezing point
D) Elevation in boiling point
Correct Answer: A
Solution :
The properties of the solutions which depend only on the number of solute particles but not on the nature of the solute are called colligative properties. Refractive index is not a colligative property while lowering of vapour pressure, depression in freezing point and elevation in boiling point are colligative properties.
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