The standard reduction potentials at \( 25^{\circ} \mathrm{C} \) for the following half reaction...

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The standard reduction potentials at \( 25^{\circ} \mathrm{C} \) for the following half reactions are given against each:
(i) \( \mathrm{Zn}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightarrow \mathrm{Zn}(\mathrm{s}),-0.762 \)
(ii) \( \mathrm{Cr}^{3+}(\mathrm{aq})+3 \mathrm{e}^{-} \rightarrow \mathrm{Cr}(\mathrm{s}),-0.740 \)
(iii) \( 2 \mathrm{H}^{+}+2 \mathrm{e}^{-} \rightarrow \mathrm{H}_{2}(\mathrm{g}), 0.00 \)
(iv) \( \mathrm{Fe}^{3+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Fe}^{2+}, 0.77 \)
Which is the strongest reducing agent?
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