Question

Use of the salt bridge in the Galvanic cell is :
a.) To complete the electrical circuit
b.) To separate the cathode solution from the anode solution
c.) To reduce electrical resistance
d.) To supply the salts to the chemical reactions taking place in the cell

Answer 1

Salt bridge forms a junction between two half cells completing the electrical circuit in the electrochemical cell. Salt bridge does not let the molecule move out of its u - shaped tube which is plugged with cotton on both sides.

Complete step by step answer:
A salt bridge is a junction that connects oxidation half-cell with reduction half-cell in an electrochemical cell. It generally contains strong electrolyte so that it can easily dissociate.
Now, coming on the functions of the salt bridge.
The first thing it does is that it completes the electric circuit because it acts as a contact between two half cells. So, option a.) given to us is true.
Two solutions anode and cathode are separated well by the salt bridge only. So, option b.) is also correct.
Another is that it maintains electrical neutrality within the circuit. It helps in a continual flow of charge. Thus, it reduces electrical resistance. So, option c.) is also correct.
The option d.) is that it allows the supply of salts to chemical reactions taking place in the cell. This is not correct because it transfers only the electrons, not the molecules.

Hence, the correct answer is (c).

Note:
If there is no salt bridge then the anodic and cathodic half cells will be connected only from one side and the circular circuit is not complete. There will be a further accumulation of negative charge in one solution and positive charge in another solution.