Question

Why is salt bridge used in a voltaic cell?

• A. It prevents voltage drop
• B. It allows flow of current by completing the circuit
• C. It helps in accumulation of charges
• D. Salt bridge form a electrolyte

Answer 1

Answer: (A), (B), (D)

The correct options are
A It prevents voltage drop
B It allows flow of current by completing the circuit
D Salt bridge form a electrolyte

A salt bridge is used to connect the oxidation and reduction half-cells of a galvanic cell (voltaic cell).

1. It maintains electrical neutrality within the internal circuit, preventing the cell from rapidly running its reaction to equilibrium. Hence, it prevent voltage drop.
2. It allows the flow of current through it completing the circit between the two half-cells.
   
3. Salt bridge generally consists of filter paper soaked with a relatively inert electrolyte, usually potassium chloride or sodium chloride.

Hence, A, B, D are correct.