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Why the freezing point depression (Delta...

Why the freezing point depression `(DeltaT_(f))` of 0.4 M NaCl solution is nearly twice than that of 0.4M glucose solution ?
Among equimolal aqueous solutions of `MgCl_(2),NaCl,FeCl_(2) and C_(12)H_(22)O_(11)`, which has high osmotic pressure ? Why ?

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(i) The colligative property which depends on the number of particles in the solution.
(ii) `C_(12)O_(22)O_(11)` Osmotic pressure is a colligative property which depends on the number of particles.
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