JEE Advanced 2014 Chemistry question

In a galvanic cell, the salt bridge

(A)does not participate chemically in the cell reaction.Correct
(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)

Solution

A salt bridge (e.g. KCl or in agar) completes the internal circuit by allowing migration of its inert ions to maintain electrical neutrality in the two half-cells; its ions do not take part in the cell reaction (A true). It does not stop ionic movement — ions migrate through it (B false) — and it

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Question ID VK-026269