Question

Statement 1: Micelles are formed by surfactant molecules above the critical micellar concentration $(CMC)$.
Statement 2: The conductivity of a solution having sufficient molecules decreases sharply at the $CMC$.

• A. If both Statement $1$ and Statement $2$ are true and the statement $2$ is the correct explanation of the statement $1$
• B. If both Statement $1$ and Statement $2$ are true but statement $2$ is not the correct explanation of the statement $1$
• C. If Statement $1$ is true but Statement $2$ is false
• D. If Statement $1$ is false but Statement $2$ is true

Answer 1

Answer: (B)

The formation micelles takes place above $CMC$. Hence statement $1$ is true. Each micelle contains at least $100$ molecules. Hence, conductivity of the solution decreases sharply at the $CMC$. Hence reason is also true but it is not the correct explanation of statement $1$.