Chemistry - Electrochemistry Question with Solution | TestHub

As we know that $\Delta {\mathrm{E}}_{\text{cell }}={\mathrm{E}}_{\text{cathode }}-{\mathrm{E}}_{\text{anode }}$ when ${\mathrm{E}}_{\text{cathode }}={\mathrm{E}}_{\text{anode }}$ $\Delta {\mathrm{E}}_{\text{cell }}=0$ If $\Delta {\mathrm{E}}_{\text{cell }}=0$ no net reaction occurs. The reactants and products are at equilibrium and no current will flow. Note that it is only possible to obtain electrical work from a system that is not at equilibrium. In order for current to flow, there must be a net reaction occurring. As the oxidation- reduction reaction proceeds toward equilibrium, and the concentrations of the reacting species approach their equilibrium values, the EMF of the cell decreases to zero. When the system is at equilibrium, the cell potential is zero and we have a dead battery.