In a salt bridge , KCl is used because:

Options

A. It is an electrolyte
B. It is good conductor of electricity
C. The transport number of `K^(+)` and `Cl^(-)` ions are nerarly same or both have same ionic mobility
D. It is ionic compound

Answer

A

Explanation

Salt bridge is used to remove or eliminate liquid junction potential arised due to different relative speed of ions of electrolytes at the junction of two electrolytes in an electrochemical cell. Thus, a salt bridge is used for this purpose should have almost same speeds of its cation and anion.