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Question

The standard reduction potential of Cu2+/Cu and Cu2+/Cu+ are 0.337 and 0.153 V respectively. The standard electrode potential of Cu+/Cu half cell is:

A
0.184 V
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B
0.827 V
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C
0.521 V
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D
0.490 V
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Solution

The correct option is C 0.521 V
Cu2++2eCu; G1(1)Cu2++eCu+; G2(2)
Subtracting (2) from (1) we get
Cu++eCu; G3Now,ΔG3=nFE3ΔG3=ΔG1ΔG2
FE3=2FE1(FE2)E3=2E1E2E3=2×0.3370.153 =0.521 V

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