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. If both (A) and (R) are correct, and (R) is the correct explanation of (A).
B. If both (A) and (R) are correct, but (R) is not the correct explanation of (A).
C. If (A) is incorrect, but (R) is correct.
D. If both (A) and (R) are incorrect.

Answer

B

Explanation

Both assertion and reason are correct. A micelle of formed when a veriety of molecules such as soap and deterents are added to water. The molecule may be a fatty acid,a sltt of fatty acid (doap), phospholipid, or other similar molecule. The non-polar tails of the molecule chump into the centre of a ball-like structure called a micelle because they are hydrophobic. At some concentration, the surface becomes completely loaded with surface and any further additions arrange as micelles. This concentration is called the critical micellization concentration (CMC). This cause a decreases in the number of free ions to conduct electricity. thus conductivity decreases at CMC.