A cationic colloidal electrolyte forms micelle at concentration in water

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Problem

A cationic colloidal electrolyte forms micelle at

10^{-4} M

concentration in water. If

1 \text{ mm}^3

solution contains

10^{12}

micelle structure, then the no. of cations involved in one micelle are : (1) 20 (2) 40 (3) 60 (4) 80