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For which of the following electrode reactions the standard electrode potential is the highest at 298 K? The ions are present in aqueous solution.

  • A.\(\mathrm{Co^{3+} + e^{-} \rightarrow Co^{2+}}\)
  • B.\(\mathrm{Cl_{2(g)} + 2e^{-} \rightarrow 2Cl^{-}}\)
  • C.\(\mathrm{MnO_{2(s)} + 4H^{+} + 2e^{-} \rightarrow Mn^{2+} + 2H_{2}O}\)
  • D.\(\mathrm{F_{2(g)} + 2e^{-} \rightarrow 2F^{-}}\)
  • E.\(\mathrm{AgCl_{(s)} + e^{-} \rightarrow Ag_{(s)} + Cl^{-}}\)

Answer: D

The highest standard potential is for \(\mathrm{F_{2}(g) + 2e^{-} \rightarrow 2F^{-}}\).

Fluorine is the strongest oxidising agent, with \(E^{0} = +2.87\) V. The others, in volts, are Co3+/Co2+ +1.81, Cl2/Cl− +1.36, MnO2/Mn2+ +1.23 and AgCl/Ag +0.22.

All are positive, but F2 is the largest, which is why fluorine oxidises everything else on the list.

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