The boiling point of 0.2 m o l k g - 1 solution of X in water is greater than equimolal solution of Y in…

The boiling point of 0.2 mol kg-1 solution of X in water is greater than equimolal solution of Y in water. Which one of the following statements is true in this case?
  1. X is undergoing dissociation in water
  2. Molecular mass of X is greater than the molecular mass of Y.
  3. Molecular mass of X is less than the molecular mass of Y.
  4. Y is undergoing dissociation in water while X undergoes no change

Solution

∆Tb=i Kb.m
Kb & m are constant for solutions of X and Y. ∆Tb is greater for solution of X implies i (Van't Hoff factor for X > 1) i.e X undergoes dissociation.

Asked in: NEET 2015 (Phase 1)

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