Statement - I : Micelles are formed by surfactant molecules above the critical micelle concentration (CMC).
Statement - II : The conductivity of a solution having surfactant molecules decreases sharply at the CMC.

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Both statements I and II are correct

Statement-I is correct and statement-II is incorrect

Statement-I is incorrect and statement-II is correct

Both statements I and II are incorrect

answer is A.

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Detailed Solution

critical micelle concentration (CMC) is the concentration of surfactants above which micelles form and all additional surfactants added to the system go to micelles.

Aggregation of surfactant molecules (ions; RCOO^-) i.e. micelle formation cause effective fall in number of free ions to conduct electricity, thus conductivity decreases at CMC.

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