The standard reduction potentials at $298 \mathrm{~K}$ for the following half reactions are given against…

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

Solution

Since oxidation potential of $\mathrm{Zn}$ is highest hence strongest reducing agent. .

Asked in: JEE-TOPICTESTS-CHEMISTRY

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