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Cu(aq) is unstable in solution and undergoes simultaneous oxidation and reduction according to the reaction: 2Cu+ (aq) → Cu2+ (aq) + Cu(s) Choose correct E° for above reaction if E°Cu2+/Cu+ = 0.34 V and E°Cu2+/Cu = 0.15 V

1. -0.38 V
2. +0.49 V
3. +0.38 V
4. -0.19 V

Correct answer: +0.38 V

Solution

The reaction involves Cu+ being oxidized to Cu2+ and reduced to Cu(s). Using the formula E°cell = E°reduction - E°oxidation, we calculate E°cell = 0.34 V - 0.15 V = +0.38 V.

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