STATEMENT-1: Micelles are formed by surfactant molecules above the critical micellar concentration (CMC).
because
STATEMENT-2: The conductivity of a solution having surfactant molecules decreases sharply at the CMC.
← IIT-JEE 2007 · Paper 1
ChemistryAssertion and reason+3 / -1Question 35 of 66
IIT-JEE 2007 · Paper 1, Chemistry question 35
Answer and worked solution
Official answer: B
Statement 1. Above the CMC surfactant molecules aggregate into micelles. True.
Statement 2. At the CMC the conductivity-concentration plot shows a sharp break (the conductivity rises much more slowly once ions are tied up in micelles). Taken as true; it is an observation used to detect the CMC, not the reason micelles form.
(B)
Topics:Colloids