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Question:

The boiling point of a 0.2 mol/kg solution of X in water is greater than an equimolal solution of Y in water. Which one of the following statements is true in this case?

Y is undergoing dissociation in water while X undergoes no change

Molecular mass of X is less than the molecular mass of Y

Molecular mass of X is greater than the molecular mass of Y

X is undergoing dissociation in water

Solution:

(ΔTb)x > (ΔTb)y
Same solvent so, Kb is same
m is same (given)
ix.Kb.m > iy.Kb.m
⇒ix > iy
So, X is undergoing dissociation in water.
Hence, the correct option is D