Question

Given below are two statements Assertion (A): Conductivity of an electrolyte decreases on dilution Reason (R): On dilution number of ions per unit volume increases The correct answer is

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
• B. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
• C. (A) is correct but (R) is incorrect
• D. (A) is incorrect but (R) is correct

Hint:

While the number of ions increases on dilution, their mobility reduces, which causes a decrease in conductivity.

Answer 1

The Correct Option is C

- Assertion (A) is correct: Conductivity of an electrolyte decreases upon dilution. This happens because the total number of ions in the solution decreases as the electrolyte dissociates to form more ions, but the ions are spaced further apart, reducing the conductivity. - Reason (R) is incorrect: On dilution, while the number of ions increases, their individual mobility decreases due to increased distance between ions. The overall conductivity decreases, contradicting the reason provided in the statement. Thus, the correct answer is \( \boxed{\text{(A) is correct but (R) is incorrect}} \).