There are following the three solvents $ \mathrm{X}, \mathrm{Y} \& \mathrm{Z} $. They have identical molar masses. Match their boiling point with their $ \mathrm{k}_{\mathrm{b}} $ values: $ \begin{array}{ccc}\text { Solvent } & \text { B. Pt. } & \mathrm{K}_{\mathrm{b}} \ \mathrm{X} & 100^{\circ} \mathrm{C} & 0.92 \ \mathrm{Y} & 27^{\circ} \mathrm{C} & 0.63 \ \mathrm{Z} & 283^{\circ} \mathrm{C} & 0.53\end{array} $ Among the following, which is the correct relation between the boiling point and $ \mathrm{K}_{\mathrm{b}} $ values for $ \mathrm{X}, \mathrm{Y}, \mathrm{Z} $ respectively?

Question

There are following the three solvents $ \mathrm{X}, \mathrm{Y} \& \mathrm{Z} $. They have identical molar masses. Match their boiling point with their $ \mathrm{k}_{\mathrm{b}} $ values: $ \begin{array}{ccc}\text { Solvent } & \text { B. Pt. } & \mathrm{K}_{\mathrm{b}} \ \mathrm{X} & 100^{\circ} \mathrm{C} & 0.92 \ \mathrm{Y} & 27^{\circ} \mathrm{C} & 0.63 \ \mathrm{Z} & 283^{\circ} \mathrm{C} & 0.53\end{array} $ Among the following, which is the correct relation between the boiling point and $ \mathrm{K}_{\mathrm{b}} $ values for $ \mathrm{X}, \mathrm{Y}, \mathrm{Z} $ respectively?, $ 100^{\circ} \mathrm{C}-0.92,27^{\circ} \mathrm{C}-0.63,283^{\circ} \mathrm{C}-0.53 $, $ 100^{\circ} \mathrm{C}-0.53,27^{\circ} \mathrm{C}-0.63,283^{\circ} \mathrm{C}-0.92 $, $ 100^{\circ} \mathrm{C}-0.63,27^{\circ} \mathrm{C}-0.53,283^{\circ} \mathrm{C}-0.92 $, $ 100^{\circ} \mathrm{C}-0.53,27^{\circ} \mathrm{C}-0.92,283^{\circ} \mathrm{C}-0.63 $

MARKS App · Accepted Answer

K b = MRT b ∘ 2 1 0 0 0 Δ H vap K b ∝ M T b ∘ Δ H vap T b ∘ K b ∝ T b ∘ Δ S vap ∘ Δ S ∘ will be same for three liquids changing to vapours for 1 mole ∴ K b ∝ T b ∘

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