Saturated solution of `KNO_3` is used to make "salt bridge" because .

Options

A. Velocity of `K^(+)` is greater than that of `NO_(3)^(-)`
B. Velocity of `NO_(3)^(-)` is greater than that of `K^(+)`
C. Velocities of both `K^(+) and NO_(3)^(-)` are nearly the same
D. `KNO_(3)` is highly soluble in water

Answer

C

Explanation

The salt used to make 'salt-bridge' must be such that the ionic mobility of cation and anion are of comparable order so that they can keep the anode and cathode half cells neutral at all times.