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

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Hint: Salt bridge is used to maintain the electrical neutrality of the solution in the two half solution ,i.e oxidation half reaction and reduction half reaction.

A salt bridge is a U shape tube containing concentrated solution of inert electrolyte like $KCl, KNO_3$, etc. As salt bridge is made up of inert electrolyte. Inert electrolytes are those electrolytes whose ions do not take part in the redox reaction and also do not react with the electrolytes used in the oxidation and reduction half reactions of the cell. The main function of the salt bridge is to allow the movement of the ions from one solution to the other solution without mixing of the two solutions.