Q.

The function of a salt bridge is

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to provide a link between two half cells

to allow ions to go from one cell to another

to keep the emf of the cell positive

to maintain electrical neutrality of the solution in two half cells

answer is 4.

(Detailed Solution Below)

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Detailed Solution

In galvanic cell if there is no salt bridgeAnode looses electrons and positive charge is accumulated.Cathode gains electrons and negative charge is accumulated. Accumulation of charges prevents flow of electrons and cell reaction does not occur. Salt bridge is presentPrevents accumulation of charges by flowing the ions of elctrolyte of saltbridge in opposite direction and fecilitates flow of electrons.

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