Cu^+(a q) is unstable in solution and undergoes simultaneous oxidation and reduction according to...

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Cu^+(a q) is unstable in solution and undergoes simultaneous oxidation and reduction according to the reaction:

2 Cu^+(a q) ⇌Cu^2+(a q)+Cu(s)

Choose correct E^∘ for given reaction if E^∘Cu^2+ / Cu=0.34  V and E^∘Cu^2+ / Cu^+=0.15  V
(a) -0.38  V
(b) +0.49  V
(c) +0.38  V
(d) -0.19  V

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