A conductivity cell with two electrodes (dark side) are half filled with infinitely dilute aqueous solution of a weak electrolyte. If volume is doubled by adding more water at constant temperature, the molar conductivity of the cell will -
(A)increase sharply
(B)remain same or can not be measured accurately✓ Correct
(C)decrease sharply
(D)depend upon type of electrolyte
Answer: (B)
Solution
The solution is already infinitely dilute, so the molar conductivity is at its limiting value Λm∘. Adding more water causes no further change in the molar conductivity (and the extremely low conductivity makes an accurate measurement impossible). Hence it remains the same / cannot be measured accurately.
JEE Main · 2024 · 06 Apr 2024 · Shift 1 · Single correct option
