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Question

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

A
Zn|Zn2+(1M)||Cu2+(1M)|Cu
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B
Zn|Zn2+(1M)||Ag+(1M)|Ag
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C
Cu|Cu2+(1M)||Ag+(1M)|Ag
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D
Zn|Zn2+(1M)||Co2+(1M)|Co
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