Which of the following is NOT a colligative property of a solution?
ADepression of freezing point
BRelative lowering of vapour pressure
COsmotic pressure
DViscosity of the solution
Answer & Solution
Correct answer: D. Viscosity of the solution
1. Colligative properties depend only on the number of solute particles, not their nature.
2. The four colligative properties are relative lowering of vapour pressure, elevation of boiling point, depression of freezing point and osmotic pressure.
3. Viscosity is not on this list, so it is not a colligative property.
_Source: NCERT Class 12 Chemistry Ch 1 "Solutions", p.14_
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