Assertion: Detergents with low CMC are more economical to use.

Reason : Cleansing action of detergents involves the formation of micelles. These are formed when the concentration of detergents becomes equal to CMC.

Assertion and reason both are correct but reason does not explain assertion

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Assertion is correct but reason is incorrect.

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Assertion is incorrect but reason is correct.

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Assertion and reason both are correct and the reason is the correct explanation of assertion

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Both assertion and reason are incorrect.

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is D
Assertion and reason both are correct and the reason is the correct explanation of assertion

CMC means critical micelle concentration. The CMC is an important characteristic of a surfactant.

All the concentration of surfactants above this CMC favours the formation of micelles and all additional surfactants added to the system go to micelles.

Cleansing action of detergents involves the formation of micelles.

Lesser the CMC, better and more economical is the detergent is,as micelle formation is needed for the cleaning of oil and dirt from our clothes.

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

Suggest Corrections

Similar questions

Q. Assertion :Lower is the critical micelle concentration of a surfactant, more is its detergency. Reason: Sodium dodecanoate has higher CMC than sodium octanoate.

Choose the correct option.

Q. Assertion :Surfactant molecules form micelles above the critical micelle concentration (CMC). Reason: The conductance of solution of surfactant molecules decreases sharply at the (CMC).

Sythetic detergents have advantage over usual soaps as far as cleansing power is concerned. But use of synthetic detergents over a long time creates environmental pollution. How can the pollution caused by synthetic detergents be minimised? Classify the detergents according to their chemical nature.

Q. Question 34
Why are detergents better cleansing agents than soaps? Explain.

Q. Assertion :Surfactants possess surface activity. Reason: Detergents possess surface activity and cleansing action.

Join BYJU'S Learning Program

Explore more

Synthesis of Phenols II

Standard XII Chemistry

Join BYJU'S Learning Program

Assertion: Detergents with low CMC are more economical to use. Reason : Cleansing action of detergents involves the formation of micelles. These are formed when the concentration of detergents becomes equal to CMC.

Assertion: Detergents with low CMC are more economical to use.

Reason : Cleansing action of detergents involves the formation of micelles. These are formed when the concentration of detergents becomes equal to CMC.