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Question

The electrode potential for
Cu2+(aq)+eCu+(aq) and Cu+(aq)+eCu(s) are +0.15 V and +0.50 V respectively. The value of EoCu2+/Cu will be:

A
0.150 V
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B
0.500 V
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C
0.325 V
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D
0.65
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Solution

The correct option is C 0.325 V
We know that:
nE0half cell=n1E01+n2E02
Given data:
Cu2+(aq)+eCu+(aq)
n1=1 & E01=0.15V
Cu+(aq)+eCu(s)
n2=1 & E02=0.50
We have to calculate E0 for
Cu2++2eCu(s)
n=2
On putting all values we get
2E0Cu2+/Cu=0.15+0.50
E0Cu2+/Cu=0.325V

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