JEE Advanced 2007 Chemistry question

STATEMENT-1 : Micelles are formed by surfactant molecules above the critical micellar concentration (CMC). because STATEMENT-2 : The conductivity of a solution having surfactant molecules decreases sharply at the CMC.

(A)Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1
(B)Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1Correct
(C)Statement-1 is True, Statement-2 is False
(D)Statement-1 is False, Statement-2 is True

Answer: (B)

Solution

Statement-1: surfactant molecules aggregate into micelles only above the critical micelle concentration: true. Statement-2: at the CMC the ions aggregate into large, slower micelles and bind counter-ions, so the (molar)

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Question ID VK-037438