Question

Iron is a component of many of the electron carriers of the eletron-transport chain. How can it participate in a series of coupled redox reactions if the E₀^' is +0.77V

Answer 1

The electrochemical series is madeup by arranging various redox equilibria in order of their standard electrode potentials (redox potentials). The most negative E° values are placed at the top of the electrochemical series, and the most positive at the bottom. Iron is present approximately central of this series which it can participate both oxidation as well reduction reaction. Hence Fe is a component of many of the electron carriers of the eletron-transport chain.

It can be reduced or oxidized by other elements.