Solutions and Colligative Properties 2 Question 30
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 |
|---|---|---|
| $X$ | $100^{\circ} \mathrm{C}$ | 0.92 |
| $Y$ | $27^{\circ} \mathrm{C}$ | 0.63 |
| $Z$ | $283^{\circ} \mathrm{C}$ | 0.53 |
(2003)
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Solution:
- 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 | $\boldsymbol{K}_{\boldsymbol{b}}$ |
|---|---|---|
| $X$ | $100^{\circ} \mathrm{C}$ | 0.63 |
| $Y$ | $27^{\circ} \mathrm{C}$ | 0.53 |
| $Z$ | $283^{\circ} \mathrm{C}$ | 0.92 |
