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Question

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

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

C
Assertion is correct but Reason is incorrect

D
Both Assertion and Reason are incorrect

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Text SolutionText solutionverified iconVerified

In colloids, critical micelle concentration (CMC) is the concentration of surfactants above which micelles form and all additional surfactants added to the system go to micelles. 
Below the CMC, the addition of surfactant to an aqueous solution causes an increase in the number of charge carriers  and consequently, an increase in the conductivity. Above the CMC, further addition of surfactant increases the micelle concentration while the monomer concentration remains approximately constant (at the CMC level). Since a micelle is much larger than a monomer, it diffuses more slowly through solution and so, is a less efficient charge carrier.
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Question Text
Assertion :Micelles are formed by surfactant molecules above the critical micellar concentration (CMC).
Reason :The conductivity of a solution having surfactant molecules decreases sharply at the CMC.
Answer TypeText solution:1
Upvotes150