Question

If the molality of the dilute solution is doubled, the value of molal depression constant will be

• A. Unchanged
• B. Halved
• C. Doubled
• D. Tripled

Answer 1

The correct option is A Unchanged

The molal depression constant $\left(K_f\right)$ is a attributed property of the solvent. It has nothing to do with the concentration of solute.
If the molality of a dilute solution is doubled, the value of the molal depression constant $\left(K_f\right)$ remains unchanged because molal depression is constantly dependent on the nature of the solvent, not on solute.
Hence the correct option is option (a)