Which of the following set of ions act as oxidising agents?

Question

Professor PC Thomas Classes · Answer

(a) : The formation of Ce (IV) is favoured by its noble gas configuration, but it is a strong oxidant reverting to the common +3 state. The $E^{\circ}$ value for $\mathrm{Ce}^{4+} / \mathrm{Ce}^{3+}$ is +1.74 V which suggests that it can oxidise water. $\mathrm{Tb}(\mathrm{IV})$ has half-filled $f$-orbitals and is an oxidant.