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JEE Main levelSingle correct optionDifficulty 1 of 3ec16

The limiting molar conductivity $Λ_{m}^{\circ}$ can be obtained by extrapolating a plot of $Λ_{m}$ against $c$ to $c = 0$ for

Astrong electrolytes only
Bweak electrolytes only
Cboth strong and weak electrolytes
Dneither; it must always be computed by Kohlrausch's law

Answer: A

For strong electrolytes

Λ_{m} = Λ_{m}^{\circ} - A c

(Debye-Huckel-Onsager), a straight line that can be extrapolated. For weak electrolytes

Λ_{m}

rises steeply near

c = 0

because

α \to 1

, so extrapolation fails and Kohlrausch's law is used instead.

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