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Which of the following is a colligative property?

  1. AViscosity of the solution
  2. BRefractive index of the solution
  3. CDensity of the solution
  4. DRelative lowering of vapour pressure

Answer: D

Colligative properties depend only on the number of solute particles and not on their nature. Relative lowering of vapour pressure qualifies; viscosity, refractive index and density depend on the identity of the solute.
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