Question:
What is the molal elevation constant of solvent ?
What is the molal elevation constant of solvent ?
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Boiling point elevation is proportional to molality, and the constant is the ratio of the two.
Updated On: Nov 12, 2026
- ratio of boiling point elevation to molarity of solution.
- ratio of boiling point elevation to mole fraction of solution.
- ratio of boiling point elevation to molarity of solute.
- ratio of boiling point elevation to molality of solution.
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
For a dilute solution, \(\Delta T_{b}=K_{b}\,m\), where \(m\) is the molality.
Step 2: Rearrange
\(K_{b}=\dfrac{\Delta T_{b}}{m}\).
It equals the elevation for a 1 molal solution, with units K kg \(\text{mol}^{-1}\).
Step 3: Conclusion
The constant is the ratio of boiling point elevation to the molality of the solution.
Final Answer:
The molal elevation constant is the ratio of boiling point elevation to molality. \[ \boxed{\text{(D) }\text{ratio of boiling point elevation to molality of solution.}} \]
For a dilute solution, \(\Delta T_{b}=K_{b}\,m\), where \(m\) is the molality.
Step 2: Rearrange
\(K_{b}=\dfrac{\Delta T_{b}}{m}\).
It equals the elevation for a 1 molal solution, with units K kg \(\text{mol}^{-1}\).
Step 3: Conclusion
The constant is the ratio of boiling point elevation to the molality of the solution.
Final Answer:
The molal elevation constant is the ratio of boiling point elevation to molality. \[ \boxed{\text{(D) }\text{ratio of boiling point elevation to molality of solution.}} \]
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