Given the Half-Reactions And $\mathrm{E}_{\mathrm{red}}^{\circ}$ Values Below,determine Which Species Is the Best Reducing Agent

question 36

Multiple Choice

Given the half-reactions and $\mathrm{E}_{\mathrm{red}}^{\circ}$ values below,determine which species is the best reducing agent.
$\begin{array}{ll}\mathrm{MnO}_{4}-(a q) +8 \mathrm{H}^{+}(a q) +5 e^{-} \rightarrow \mathrm{Mn}^{2+}(a q) +4 \mathrm{H}_{2} \mathrm{O}(l) & \mathrm{E}_{\mathrm{red}=+1.512 \mathrm{~V}}^{\circ} \\4 \mathrm{H}^{+}(a q) +\mathrm{NO}_{3}-(a q) +3 e^{-} \rightarrow \mathrm{NO}(g) +2 \mathrm{H}_{2} \mathrm{O}(l) & \mathrm{E}_{\mathrm{red}=+0.964 \mathrm{~V}}^{\circ} \\\mathrm{Fe}^{3+}(a q) +e-\rightarrow \mathrm{Fe}^{2+}(s) & \mathrm{E}_{\mathrm{red}}^{\circ}=+0.771 \mathrm{~V} \\2 \mathrm{H}^{+}(a q) +2 e^{-} \rightarrow \mathrm{H}_{2}(g) & \mathrm{E}_{\text {red }}^{\circ}=0.000 \mathrm{~V}\end{array}$

• A) H⁺
• B) H₂
• C) Fe²⁺
• D) NO₃?
• E) MnO₄?

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