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Question

The standard electrode potentials of Cu2+|Cu+ and Cu+|Cu electrodes are +0.18V and +0.50V. The potential of Cu2+|Cu electrode is _________.

A
0.34V
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B
0.44V
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C
-0.34V
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D
-0.44V
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Solution

The correct option is A 0.34V

The given electrode potentials are:
Cu2++eCu+, E01=+0.18V;ΔG01=1×0.18×F unit

Cu++eCu, E02=0.50V,ΔG02=1×0.50×F unit

Let the required electrode potential be x V. Then
Cu2++2eCu, E0=x0; ΔG0=2×x×F unit

Now for the electrode reaction

ΔG0=ΔG01+ΔG02

(2×x×F)=(0.18F)+(0.50F), x=0.34V

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