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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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Statement I and II are correct and II explains I

Statement I is correct and II is incorrect

Statement - I is incorrect and Statement - II is correct

Both statement - I and II are incorrect

answer is A.

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Detailed Solution

Surfactant molecules (soap and detergents) associate to form colloids above certain concentration

called critical micelle concentration (CMC)

CMC is 10^-4M - 10^-3M and a minimum of 100 molecules must associate.

At CMC association occurs, no.of ions decreases and conductivity decreases

I & II are correct

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