Question

Which of the following is ionic mobility independent of?

(a) Size of ion

(b) Charge on ion

(c) Distance of separation between the electrodes

(d) Concentration of electrolyte

I have been asked this question in a national level competition.

This intriguing question comes from Conductance of Electrolytic Solutions topic in section Electrochemistry of Chemistry – Class 12

Answer 1

Right choice is (c) Distance of separation between the electrodes

Easiest explanation: Ionic mobility is an inherent property of the electrolytic solution and is hence, independent of the distance of separation between the two electrodes. As the charge to size ratio increases, the ionic mobility decreases.