Consider the Following Standard Reduction Potentials in Acid Solution The Weakest Reducing Agent Listed Above Is
A) Cr³⁺

question 99

Multiple Choice

Consider the following standard reduction potentials in acid solution: $\begin{array}{ll}\mathrm{Cr}^{3+}+3 \mathrm{e}^{-} \rightarrow \mathrm{Cr} & \mathrm{E}^{\circ}=-0.74 \mathrm{~V} \\\mathrm{Co}^{2+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Co} & \mathrm{E}^{\circ}=-0.28 \mathrm{~V} \\\mathrm{MnO}_{4^{-}}+8 \mathrm{H}^{+}+5 \mathrm{e}^{-} \rightarrow \mathrm{Mn}^{2+}+4 \mathrm{H}_{2} \mathrm{O} & \mathrm{E}^{\circ}=+1.51 \mathrm{~V}\end{array}$ The weakest reducing agent listed above is

• A) Cr³⁺.
• B) Cr.
• C) Mn²⁺.
• D) Co.
• E) MnO₄^-.

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