Question

The standard reduction potential values of some of the p-block ions are given below. Predict the one with the strongest oxidising capacity.

• A. \( {E}^\circ \, {I}_3^- / {I}_2 = +1.26 \, {V} \)
• B. \( {E}^\circ \, {Al}^{3+} / {Al} = -1.66 \, {V} \)
• C. \( {E}^\circ \, {Pb}^{4+} / {Pb}^{2+} = +1.67 \, {V} \)
• D. \( {E}^\circ \, {Sn}^{4+} / {Sn}^{2+} = +1.15 \, {V} \)

Hint:

In redox reactions, the species with the highest positive reduction potential is the strongest oxidising agent.

Answer 1

The Correct Option is C

The strength of an oxidising agent is directly related to its reduction potential. The higher the reduction potential, the stronger the oxidising agent. Among the options, the highest reduction potential is for \( {Pb}^{4+} / {Pb}^{2+} \), with a value of \( +1.67 \, {V} \). Thus, the strongest oxidising agent is \( {Pb}^{4+} \).