Comprehension \( \quad: \) The experimental values of colligative properties of many solutes in ...

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Comprehension \( \quad: \) The experimental values of colligative properties of many solutes in solution resembles calculated values of colligative properties.

However in same cases, the experimental value of colligative property differ widely than those obtained by calculation. Such experimental values of colligative properties are known as Abnormal values of colligative property. Cause for abnormal values of colligative properties are:
(i) Dissociation of solute: It increases the colligative properties.
e.g.: Dissociation of \( \mathrm{KCl}, \mathrm{NaCl} \) etc. in \( \mathrm{H}_{2} \mathrm{O} \).
(ii) Association of solute: It decreases the colligative properties.
e.g.: Dimerisation of acetic acid in benzene
One mole \( \mathrm{l}_{2} \) (solid) is added in \( 1 \mathrm{M}, 1 \) litre \( \mathrm{Kl} \) solution. Then
(a) Osmotic pressure of solution increases
(b) Freezing point of solution increases
(c) Relative lowering in vapour pressure decreases
(d) No change in boiling point of solution
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