Solutions and Colligative Properties - Result Question 59

####30. Consider the three solvents of identical molar masses. Match their boiling point with their $K _b$ values

Solvents Boiling point $\boldsymbol{K} _{\boldsymbol{b}}$ values
$X$ $100^{\circ} C$ 0.92
$Y$ $27^{\circ} C$ 0.63
$Z$ $283^{\circ} C$ 0.53

(2003)

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Solution:

  1. Higher the value of $K _b$ of a solvent suggest that there is larger polarity of solvent molecules, which in turn implies higher boiling point due to dipole-dipole interaction.

Therefore, the correct order of $K _b$ values of the three given solvents is

Solvents Boiling point $\boldsymbol{K} _{\boldsymbol{b}}$
$X$ $100^{\circ} C$ 0.63
$Y$ $27^{\circ} C$ 0.53
$Z$ $283^{\circ} C$ 0.92


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