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?

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X is undergoing dissociation in water

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

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

Y is undergoing dissociation in water while X undergoes no change

answer is D.

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Detailed Solution

${({ΔT}_{b})}_{x} > {({ΔT}_{b})}_{y}$
As same solvent is used so, K_b is same for both X and Y As m is same (given) so i_x.k_b.m > i_y. k_b. m
i_x > i_y. Hence x is undergoing dissociation in water.

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