Ncert Exercises & Solutions

Select the correct option based on statements below:

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

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	(A) is false but (R) is true.

Hint: Micelle formation takes place when the concentration of detergent becomes equal to CMC.

Detergents with low CMC are more economical to use as they involve the formation of micelle which is used for cleaning oil.

and dirt from our cloth. Micelle formation takes place when the concentration of detergent becomes equal to CMC.

CMC is a critical indicator of micellar stability and micellization ability: the lower the CMC value, the easier it is to prepare micelles and the more stable they will be.

Hence, both assertion and reason are true and the reason is the correct explanation of assertion.

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