Discussion
With reference to the variation of molar conductivity (Λm) with concentration for a strong electrolyte in an aqueous solution, the CORRECT statement is
Answer: C
Both the asymmetry effect and the electrophoretic effect contribute to decrease Λm.
In the Debye-Hückel-Onsager picture each ion is surrounded by an ionic atmosphere of opposite charge. When the ion moves in a field, the atmosphere lags behind and becomes asymmetric, pulling the ion back: the asymmetry (relaxation) effect. The atmosphere also moves the other way, carrying its solvent with it, so the ion travels against a counter-flow: the electrophoretic effect.
Both retard the ion, and both grow with concentration, which is why the molar conductivity of a strong electrolyte falls linearly with \(\sqrt{c}\). Neither effect can raise Λm, so options A, B and D are wrong.
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