Question

In a galvanic cell, the salt-bridge

• A. does not participate chemically in the cell reaction
• B. facilitates 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)

The correct options are
A does not participate chemically in the cell reaction
B facilitates the diffusion of ions from one electrode to another

This problem is based on characteristics of salt – bridge

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)