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\( \mathrm{Cu}^{+}(a q) \) is unstable in solution and undergoes simultaneous oxidation and reduction according to the reaction:
\[
2 \mathrm{Cu}^{+}(a q) \rightleftharpoons \mathrm{Cu}^{2+}(a q)+\mathrm{Cu}(s)
\]
Choose correct \( \mathrm{E}^{\circ} \) for given reaction if \( E^{\circ} \mathrm{Cu}^{2+} / \mathrm{Cu}=0.34 \mathrm{~V} \) and \( E^{\circ} \mathrm{Cu}^{2+} / \mathrm{Cu}^{+}=0.15 \mathrm{~V} \)
(a) \( -0.38 \mathrm{~V} \)
(b) \( +0.49 \mathrm{~V} \)
(c) \( +0.38 \mathrm{~V} \)
(d) \( -0.19 \mathrm{~V} \)
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