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\( \mathrm{E}^{\circ}\left(\mathrm{Ni}^{2+} / \mathrm{Ni}\right)=-0.25 \mathrm{~V} \)
\( \mathrm{E}^{\circ}\left(\mathrm{Au}^{3+} / \mathrm{Au}\right)=1.50 \mathrm{~V} \)
The emf of the voltaic cell.
\( \mathrm{Ni} / \mathrm{Ni}^{2+}(1.0 \mathrm{M}) \| \mathrm{Au}^{3+}(1.0 \mathrm{M}) \mid \mathrm{Au} \) is
(A) \( 1.25 \mathrm{~V} \)
(B) \( -1.75 \mathrm{~V} \)
(C) \( 1.75 \mathrm{~V} \)
(D) \( 4.0 \mathrm{~V} \)
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