NEET 2017 · ChemistryPrevious Year Question
If molality of the dilute solution is doubled, the value of molal depression constant () will be
Answer: (D) Unchanged. \textbf{Answer:} (D) Unchanged \textbf{Solution:} The molal depression constant (cryoscopic constant) is a characteristic property of the solvent alone.
- A.Doubled
- B.Halved
- C.Tripled
- D.Unchanged✓
Correct Answer
(D) Unchanged
Solution & Explanation
\textbf{Answer:} (D) Unchanged \textbf{Solution:} The molal depression constant (cryoscopic constant) is a characteristic property of the solvent alone. It does not depend on the amount or concentration of the solute. In , changing the molality changes the freezing-point depression , but itself stays the same. Hence is unchanged when the molality is doubled.
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