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The boiling point of 0.2 mol kg⁻¹ solution of X in water is greater than equimolar solution of Y in water. Which one of the following statements is true in this case?

1. Molecular mass of X is greater than the molecular mass of Y.
2. Molecular mass of X is less than the molecular mass of Y.
3. Y is undergoing dissociation in water while X undergoes no change.
4. X is undergoing dissociation in water.

Correct answer: X is undergoing dissociation in water.

Solution

The boiling point elevation depends on the number of particles in solution. If X has a higher boiling point, it suggests that X undergoes dissociation in water, increasing the number of solute particles.

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