The standard reduction potentials at \( 298 \mathrm{~K} \) for the following half reactions are ...
The standard reduction potentials at \( 298 \mathrm{~K} \) for the following half reactions are given against each
\( \mathrm{Zn}^{2+}(\mathrm{aq})+2 \mathrm{e} \rightleftharpoons \mathrm{Zn}(\mathrm{s}) ;-0.762 \mathrm{~V} \)
\( \mathrm{Cr}^{3+}(\mathrm{aq})+3 \mathrm{e} \rightleftharpoons \mathrm{Cr}(\mathrm{s}) ;-0.740 \mathrm{~V} \)
\( 2 \mathrm{H}^{+} \)(aq) \( +2 \mathrm{e} \rightleftharpoons \mathrm{H}_{2}(\mathrm{~g}) ; 0.00 \mathrm{~V} \)
\( \mathrm{Fe}^{3+}(\mathrm{aq})+\mathrm{e} \rightleftharpoons \mathrm{Fe}^{2+}(\mathrm{aq}) ; 0.770 \mathrm{~V} \)
Which is the strongest reducing agent?
(a) \( \mathrm{Zn} \) (s)
(b) \( \mathrm{Cr}(\mathrm{s}) \)
(c) \( \mathrm{H}_{2}(\mathrm{~g}) \)
(d) \( \mathrm{Fe}^{3+}(\mathrm{aq}) \)
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