From the following half-cell reactions and their standard potentials, what is the smallest possi...
0From the following half-cell reactions and their standard potentials, what is the smallest possible standard e.m.f. for spontaneous reactions?
\[
\begin{aligned}
\mathrm{PO}_{4}^{3-}(a q)+2 \mathrm{H}_{2} \mathrm{O}(l)+2 e^{-} \longrightarrow \mathrm{HPO}_{3}^{2-}+3 \mathrm{OH}^{-}(a q) ; & E^{\circ}=-1.05 \mathrm{~V} \\
\mathrm{PbO}_{2}(s)+\mathrm{H}_{2} \mathrm{O}(l)+2 e^{-} \longrightarrow \mathrm{PbO}(s)+2 \mathrm{OH}^{-}(a q) ; & E^{\circ}=+0.28 \mathrm{~V} \\
\mathrm{IO}_{3}^{-}(a q)+2 \mathrm{H}_{2} \mathrm{O}(l)+4 e^{-} \longrightarrow \mathrm{IO}^{-}(a q)+4 \mathrm{OH}^{-}(a q) ; & E^{\circ}=+0.56 \mathrm{~V}
\end{aligned}
\]
(a) \( +0.00 \)
(b) \( +0.74 \)
(c) \( +0.56 \)
(d) \( +0.28 \)
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