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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Answer:
Correct Answer: 30. $(0.23^{\circ} C)$
Solution:
Higher the value of $K_b$ of a solvent suggests 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 |
BETA
