JEE Advanced · Chemistry · 19. Surface Chemistry
Statement I Micelles are formed by surfactant molecules above the critical micellar concentration (CMC).
Statement II The conductivity of a solution having surfactant molecules deceases sharply at the CMC.
- A Statement I is true, Statement II is true, Statement II is a correct explanation for Statement I
- B Statement I is true, Statement II is true, Statement II is not a correct explanation for Statement I
- C Statement I is true, Statement II is false
- D Statement I is false, Statement II is true
Answer & Solution
Correct Answer
(B) Statement I is true, Statement II is true, Statement II is not a correct explanation for Statement I
Step-by-step Solution
Detailed explanation
At a certain concentration surfactant molecules start to aggregate and form micelle, the concentration is called critical micellisation concentration (CMC).
Aggregation of surfactant molecules (ions; \(\mathrm{RCOO}^{-}\)) micelle formation cause effective fall in number of free ions to conduct electricity, thus, conductivity decreases at CMC.
Aggregation of surfactant molecules (ions; \(\mathrm{RCOO}^{-}\)) micelle formation cause effective fall in number of free ions to conduct electricity, thus, conductivity decreases at CMC.
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