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ELECTROLYSIS AND ELECTROCHEMICAL CELLS
A salt bridge (figure 1) is essential in maintaining electrical neutrality in an electrochemical cell. Without a salt bridge, the two different compartments will accumulate the opposite charges and limit any further reaction.
2Ag⁺(aq) + Cu(s) →2Ag(s) + Cu²⁺(aq)
The correct answer is D.
KCl would be a good choice normally because it does not react with any of the chemicals used in the cell, and the anion and cation have similar conductivity, and hence similar migratory speed. In this case, since one of the ions is silver and silver chloride is insoluble, a KCl bridge is not appropriate.