A substance ' X ' (1.5 g) dissolved in 150 g of a solvent ' Y ' (molar mass =300 g mol ^{-1} ) led to an elevation of the boiling point by 0.5 K . The relative lowering in the vapour pressure of the solvent ' Y ' is \_\_\_\_ \times 10^{-2}. (nearest integer) [Given: K_b of the solvent =5.0 K kg mol ^{-1} ] Assume the solution to be dilute and no association or dissociation of X takes place in solution. [21 Jan 2026 Shift 2]

Solutions Part 2

Section: Chemistry

Question : 13 of 86

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A substance ' X ' (1.5g) dissolved in 150 g of a solvent ' Y ' (molar mass =300gmol−1 ) led to an elevation of the boiling point by 0.5 K . The relative lowering in the vapour pressure of the solvent ' Y ' is ____ ×10−2. (nearest integer)
[Given: Kb of the solvent =5.0Kkgmol−1 ]
Assume the solution to be dilute and no association or dissociation of X takes place in solution.

[21 Jan 2026 Shift 2]

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