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.

Surfactant molecules (soap and detergents) associate to form colloids above certain concentrationcalled 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 decreasesI & II are correct