Chemistry - Redox Reactions Question with Solution | TestHub

In $\mathrm{Mn}{\mathrm{O}}_4^{-}$ manganese is at its maximum oxidation state (+7); it can only gain electrons, so it cannot act as a reducing agent. $\mathrm{F}{\mathrm{e}}^{2+}$, $\mathrm{S}{\mathrm{O}}_3^{2-}$ and $\mathrm{C}{\mathrm{l}}^{-}$ can all be oxidised. Hence (c).