alleryMolar conductivity of a strong electrolyte at concentration c is related to its limiting value Λ°_m by the Debye-Hückel-Onsager equation
AΛ_m = Λ°_m / √c
BΛ_m = Λ°_m × c
CΛ_m = A √c − Λ°_m
DΛ_m = Λ°_m − A √c
Answer & Solution
Correct answer: D. Λ_m = Λ°_m − A √c
1. For strong electrolytes, Λ_m decreases mildly with concentration.
2. Debye-Hückel-Onsager: Λ_m = Λ°_m − A √c, where A depends on solvent and temperature.
3. Extrapolation to zero concentration gives the limiting value Λ°_m directly.
4. Weak electrolytes follow a different law and do not extrapolate linearly.
_Source: syllabus Chemistry, Unit 3 "Electrochemistry", §3.5_
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