KCl can be used in salt bridge as electrolyte in which of the following cells?

Z n | Z n C l_{2} | | A g N O_{3} | A g

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P b | P b (N O_{3})_{2} | | C u (N O_{3})_{2} | C u

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C u | C u S O_{4} | | A u C l_{3} | A u

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F e | F e S O_{4} | | P b (N O_{3})_{2} | P b

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Solution

The correct option is A $Z n | Z n C l_{2} | | A g N O_{3} | A g$
KCl can be used in salt bridge as electrolyte in option (A). This is because if salt bridge will not be there then the two elctrolytes $Z n C l_{2}$ and $A g N O_{3}$ will get mix to give $A g C l$ (ppt). Also electroneutrality will not be maintained in that case.

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