Question

In a galvanic cell, the salt-bridge:

• A. Does not participate chemically in the cell reaction
• B. Stops the diffusion of ions from one electrode to another
• C. Is necessary for the occurrence of the cell reaction
• D. Ensures mixing of the two electrolytic solutions

Answer 1

Answer: (A), (B)

Stops the diffusion of ions from one electrode to another

Functions of salt-bridge are:
(i) It connects the two half-cells and completes the cell circuit.(ii) It keeps the solutions of two half-cells and complete the cell circuit but does not participate chemically in the cell reaction.(iii) It maintains the diffusion of ions from one electrode to another electrode.
(iv) A cell reaction may also occur in the absence of salt-bridge. Sometimes, both the electrodes dip in the same electrolyte
solution and in such cases we do not require a salt-bridge.” So, option (c) is incorrect.
(v) This prevent mixing of two electrolytic solutions hence, option (d) is incorrect choice. Hence, correct choices are (a), (b).