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Q.

The standard reduction potentials of Ag, Cu, Co and Zn are 0.799, 0.337, –0.277 and – 0.762V respectively. Which of the folloing cells will have maximum cell e.m.f.?

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a

Zn / Zn2+(1M) // Cu2+(1M) / Cu

b

Zn / Zn2+(1M) // Ag+(1M) / Ag

c

Cu / Cu2+(1M) // Ag+(1M) / Ag

d

Zn / Zn2+(1M) // Co2+(1M) / Co

answer is B.

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Detailed Solution

Metal electrode having higher SRP acts as cathode and lower SRP acts as anode. Higher the difference of SRP more is EMF of cell.
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The standard reduction potentials of Ag, Cu, Co and Zn are 0.799, 0.337, –0.277 and – 0.762V respectively. Which of the folloing cells will have maximum cell e.m.f.?