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Which of the following statements about conductance and electrolytic solutions are correct? (A) The cell constant of a conductance cell depends only on the geometry of the electrodes and not on the solution filling the cell. (B) Alternating current (AC) rather than direct current (DC) is used to measure resistance in a conductance cell. (C) Kohlrausch's law of independent migration of ions is valid for both strong and weak electrolytes. (D) On dilution of an electrolyte solution, specific conductance decreases while molar conductance increases.

1. (A) Cell constant is independent of the solution in the cell.
2. (B) AC current is used instead of DC to measure resistance in a conductance cell.
3. (C) Kohlrausch's law applies to both strong and weak electrolytes.
4. (D) Dilution decreases specific conductance but increases molar conductance.

Correct answer: (A) Cell constant is independent of the solution in the cell.

Solution

All four statements A, B, C, and D are correct. The cell constant depends only on electrode geometry, AC is used to prevent polarization, Kohlrausch's law of independent ionic migration holds for all electrolytes at infinite dilution, and dilution reduces ion concentration (lowering kappa) while increasing the volume per mole (raising Lambdaₘ).

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