Chemistry - Electrochemistry Question with Solution | TestHub

Reducing power of the reduced form follows its oxidation potential (negative of the reduction potential of its couple).

${\mathrm{Ce}}^{3+}$: -1.61 V. ${\mathrm{Br}}^{-}$: -1.09 V. ${\mathrm{Fe}}^{2+}$: -0.77 V. $\mathrm{Zn}$: +0.76 V.

Order: ${\mathrm{Ce}}^{3+}<{\mathrm{Br}}^{-}<{\mathrm{Fe}}^{2+}<\mathrm{Zn}$.

Answer: (B).