The boiling point of 0.2 mol $k g^{- 1}$ 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 ?

Y is undergoing dissociation in water while X undergoes no change.

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X is undergoing dissociation in water.

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

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

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Solution

The correct option is B
X is undergoing dissociation in water.

Molality of solution of x = molality of solution of y = 0.2 mol/kg

By elevation in boiling point relation

$Δ T_{b} = i K_{b} m o r Δ T_{b} \infty$ i

$∵ Δ T_{b}$ of solution of ‘x‘ > $Δ T_{b}$ of solution of ‘y‘.

$∴$ ’i' of solution of x >i of solution of ‘y‘ $∴$ Solute of ‘x‘ undergoing dissociation.

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The boiling point of 0.2 mol kg−1solution 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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