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Question

The electrode potentials for Cu2+(aq)+eCu+(aq) and Cu+ (aq)+eCu (s) are +0.15 V and +0.50 V respectively. They value of E0Cu2+/Cu

A
0.650 V
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B
0.500 V
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C
0.150 V
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D
0.325 V
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Solution

The correct option is D 0.325 V
Cu2+(aq)+eCu+(aq) ΔG1=+0.15 VCu+ (aq)+eCu (s) ΔG2=+0.50 V
Cu2+(aq)+2eCu(s) ΔG3=?
ΔG3=ΔG1+ΔG2
2FE=1F×0.15+(1F×0.50)
2FE=0.65F
E=0.652=0.325V

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