Assertion (A): Micelles are formed by surfactant molecules above the critical micellization concentration `(CMC)` .
Reason(R): The conductivity of a solution having surfactant molecules decreases sharply at the `CMC` .

Options

A. Statement 1 is true, statmeent 2 is true, statement 2 is a correct explanation for statement 1
B. Statement 1 is true, stateement 2 is true, statement 2 is not a correct explanation for statement 1
C. Statement 1 is true, statement 2 is false
D. Statement 1 is false, statement 2 is true

Answer

B

Explanation

At a certain concentration surfactant molecules start to ggregate and form micelle, the concentration is called critical micellisation concentration (CMC). Aggregation of surfactant molecules (ions, `RCO O^(-)`) micelle formation cause effective fall in number of free ions to conduct electricity, thus, conductivity decreases at CMC.