Q74 / 180 · NEET 2015 (Phase 1) · Chemistry

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?

  • Correct answer
    A
    X is undergoing dissociation in water
  • B
    Molecular mass of X is greater than the molecular mass of Y.
  • C
    Molecular mass of X is less than the molecular mass of Y.
  • D
    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.

Hence, the correct answer is option: 'A'.

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