Surface Chemistry - Result Question 32
33.
Statement I Micelles are formed by surfactant molecules above the critical micelle concentration (CMC).
Statement II The conductivity of a solution having surfactant molecules decreases sharply at the CMC(2007)
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Answer:
Correct Answer: 33. (b)
Solution:
Both statements are independently correct but Statement II does not explain Statement I. Critical micelle concentration is the minimum concentration of surfactant at which micelle formation commences first. At critical micelle concentration, several molecules of surfactant coalesce together to form one single micelle molecule. This decreases the apparent number of molecule suddenly lowering conductivity sharply.
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