\( \mathrm{Cu}^{+}+\mathrm{e}^{-} \rightarrow \mathrm{Cu}, \quad \mathrm{E}^{0}=x_{1} \) volt \(...

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\( \mathrm{Cu}^{+}+\mathrm{e}^{-} \rightarrow \mathrm{Cu}, \quad \mathrm{E}^{0}=x_{1} \) volt
\( \mathrm{Cu}^{2+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Cu}, \mathrm{E}^{0}=\mathrm{x}_{2} \) volt, then for
\( \mathrm{Cu}^{2+}+\mathrm{e}^{-} \rightarrow \mathrm{Cu}^{+}, \mathrm{E}^{0}( \) volt \( ) \)
(a) \( \mathrm{x}_{1}-2 \mathrm{x}_{2} \)
(b) \( \mathrm{x}_{1}+2 \mathrm{x}_{2} \)
(c) \( \mathrm{x}_{1}-\mathrm{x}_{2} \)
(d) \( 2 \mathrm{x}_{2}-\mathrm{x}_{1} \)
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