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Question

Choose the correct statement(s) :
(Assume 100% ionisation)

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Solution

van't Hoff factor (i)=Number of molecules (actual)Number of molecules (expected)

For KCl:
KCl (aq.)1 K++1 Cl
i=2

K2SO4 (aq.)2K++1 SO24
i=3

Options (a) and (d) are correct.
Theory :
Affect of dissociation :
  1. No of solute particles increase
  2. Colligative property (CP) increases
  3. Molar mass (MM) of solute decreases
    Hence, Observed MM < Expected MM


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