In a galvanic cell , the salt bridge
(i) does not participate chemically in the cell reaction
(ii) stops the diffusion of ions from one electrode to another
(iii) is necessary for the occurrence of the cell reaction
(iv) ensure mixing of the electrolytic solutions.

Options

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

A, B

Explanation

Note: We feel option (C) is incorrect because in some type of concentration cells, salt bridge is not required. Which can be confirmed from NCERT (XII-Chemistry, Part-1) in Sub section 3.2 Galvanic Cell.
"The electrolytes of the two half-cells are connected internally through a salt bridge as shown in Fig. 3.1 Sometimes, both the electrodes dip in the same electrolyte solution and in such cases we do not require a salt bridge."