On the basis of the following (E^ ) values, the strongest oxidizing...

Key Idea : Oxidised form + ne $e^{-} \rightarrow$ Reduced form The substances which have lower reduction substances which have higher reduction potential are stronger oxidising agent. $$\begin{array}{l} {\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}+e^{-}} \rightarrow\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-} ; E^{\circ}=0.35 \mathrm{~V} \\ \mathrm{Fe}^{3+}+e^{-} \rightarrow \mathrm{Fe}^{2+} ; E^{\circ}=0.77 \mathrm{~V} \end{array}$$ The reduction potential of $\mathrm{Fe}^{3+} / \mathrm{Fe}^{2+}$ is higher, hence $\mathrm{Fe}^{3+}$ is strongest oxidising agent.