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Question

Given that the standard potential (E) of Cu2+/Cu and Cu+/Cu are 0.340 V and 0.522 V respectively. The E of Cu2+/Cu+ is:

A
0.182 V
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B
0.158 V
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C
+0.158 V
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D
0.182 V
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Solution

The correct option is C +0.158 V
Cu2++2eCu E=0.340 V
CuCu++e E=0.522 V
Cu2++eCu+ E=?
Applying ΔG=nFE
We get,
(1×F×E)=(2×F×0.340)+(1×F×0.522)
Solving, we get, E=0.158 V

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