Assertion (A) Detergents with low CMC are more economical to use.
Reason (R) Cleansing action of detergents involves the formation of micelles. These are formed when the cocentration of detergents becomes equal to CMC.

Options

A. Both A and Rare true and R is the correct explanation of A
B. Both A and R are true but explanation of A
C. A is true but R is false
D. A is false and R is True

Answer

A

Explanation

Cleansing of clothes takes place by micelles and their formation starts at CMC. The lesser is the CMC, the better and more economical is the detergent.