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Q.

Molar conductivity ( $\land_{m}$ ) of aqueous solution of sodium stearate, which behaves as a strong electrolyte is recorded at varying concentration(C) of sodium stearate. Which one of the following plots provides the correct representation of micelle formation in the solution?
(Critical micelle concentration (CMC) is marked with an arrow in the figures)

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a

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b

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c

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d

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answer is D.

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Detailed Solution

As the concentration of the sodium stearate increases beyond the CMC, stearate ions come close together and form micelles. This soon causes the concentration of the current carrier anions to decreases. This is reflected by the very sharp change in $λ_{m}$ at CMC, followed by greater rate of decrease of $λ_{m}$ with $\sqrt{C}$ .

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