Which out of the following is a correct equation to show change in molar conductivity with respect to concentration for a weak electrolyte, if the symbols carry their usual meaning :

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​ HA ( aq ) ⇌ H + ( aq ) + A − ( aq ) K a ​ = 1 − α α 2 C ​ α 2 C + K a ​ α − K a ​ = 0 ( λ m ∞ ​ λ m ​ ​ ) 2 C + K a ​ λ m ∞ ​ λ m ​ ​ − K a ​ = 0 λ m 2 ​ C + K a ​ λ m ​ λ m ∞ ​ − K a ​ ( λ m ∞ ​ ) 2 = 0 ​

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