Q3 ans a
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Salt bridge maintains electrical neutrality within the internal circuit, preventing the cell from rapidly running its reaction to equilibrium.
In a galvanic cell, the salt bridge does not participate chemically in the cell reaction. The ions of the electrolyte present in the salt bridge neither react with the ions of the electrode solutions, neither get oxidized nor get reduced at the electrodes.
It does not ensure the mixing of electrolytes of solution.
The diagram is only for example:-