Ncert Exercises & Solutions

Colligative properties are observed when:

(a)	A non-volatile solid is dissolved in a volatile liquid
(b)	A non-volatile liquid is dissolved in another volatile liquid
(c)	A gas is dissolved in a non-volatile liquid
(d)	A volatile liquid is dissolved in another volatile liquid

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Hint: Properties depend on the number of solute particles irrespective of their nature. Such properties are called colligative properties

When a non-volatile solute is added to a volatile solvent then vapour pressure of solution decreases.

When any of one component of binary mixture either solvent or solute is volatile it causes deviation from ideal behaviour and vapour pressure of solution which causes change in colligative property.

Hence, (a) and (b) are correct.

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