Given: \[ \begin{array}{l} \mathrm{Co}^{3+}+\mathrm{e}^{-} \rightarrow \mathrm{Co}^{2+} ; \mathr...

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Given:
\[
\begin{array}{l}
\mathrm{Co}^{3+}+\mathrm{e}^{-} \rightarrow \mathrm{Co}^{2+} ; \mathrm{E}^{\mathrm{o}}=+1.81 \mathrm{~V} \\
\mathrm{~Pb}^{4+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Pb}^{2+} ; \mathrm{E}^{\mathrm{o}}=+1.67 \mathrm{~V} \\
\mathrm{Ce}^{4+}+\mathrm{e}^{-} \rightarrow \mathrm{Ce}^{3+} ; \mathrm{E}^{\mathrm{o}}=+1.61 \mathrm{~V} \\
\mathrm{Bi}^{3+}+3 \mathrm{e}^{-} \rightarrow \mathrm{Bi} ; \mathrm{E}^{\mathrm{o}}=+0.20 \mathrm{~V}
\end{array}
\]
Oxidizing power of the species will increase in the order
(a) \( \mathrm{Co}^{3+}\mathrm{Ce}^{4+}\mathrm{Bi}^{3+}\mathrm{Pb}^{4+} \)
(b) \( \mathrm{Co}^{3+}\mathrm{Pb}^{4+}\mathrm{Ce}^{4+}\mathrm{Bi}^{3+} \)
(c) \( \mathrm{Ce}^{4+}\mathrm{Pb}^{4+}\mathrm{Bi}^{3+}\mathrm{Co}^{3+} \)
(d) \( \mathrm{Bi}^{3+}\mathrm{Ce}^{4+}\mathrm{Pb}^{4+}\mathrm{Co}^{3+} \)
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