Q114 / 200 · MHT CET - Medical 2026 (21 April Shift 1) · Chemistry
What is the molal elevation constant of solvent ?
- Aratio of boiling point elevation to molarity of solution.
- Bratio of boiling point elevation to mole fraction of solution.
- Cratio of boiling point elevation to molarity of solute.
- Correct answerDratio of boiling point elevation to molality of solution.
Solution
The elevation in boiling point is given by the relation:
$\Delta T_b = K_b \times m$
where $\Delta T_b$ is the elevation in boiling point, $K_b$ is the molal elevation constant, and $m$ is the molality of the solution.
Rearranging the formula, we get:
$K_b = \dfrac{\Delta T_b}{m}$
Thus, the molal elevation constant is the ratio of the boiling point elevation to the molality of the solution.
Answer: ratio of boiling point elevation to molality of solution.
$\Delta T_b = K_b \times m$
where $\Delta T_b$ is the elevation in boiling point, $K_b$ is the molal elevation constant, and $m$ is the molality of the solution.
Rearranging the formula, we get:
$K_b = \dfrac{\Delta T_b}{m}$
Thus, the molal elevation constant is the ratio of the boiling point elevation to the molality of the solution.
Answer: ratio of boiling point elevation to molality of solution.
Hence, the correct answer is option: 'D'.