Chemistry Question from JEE Main 2026 · 21 January, Shift 2

A substance 'X' ($1.5 \, \text{g}$) dissolved in $150 \, \text{g}$ of a solvent 'Y' (molar mass = $300 \, \text{g mol}^{-1}$) led to an elevation of the boiling point by $0.5 \, \text{K}$. The relative lowering in the vapour pressure of the solvent 'Y' is _____ $\times 10^{-2}$. (nearest integer)

[Given : $K_{b}$ of the solvent = $5.0 \, \text{K kg mol}^{-1}$]

Assume the solution to be dilute and no association or dissociation of X takes place in solution.