For a Particular Battery Based on One of the Following

Multiple Choice

For a particular battery based on one of the following reactions,E is expected to remain constant with time until the cell reactants are almost completely consumed.Which is the appropriate reaction?

A) Zn(s) + 2 MnO₂(s) + 2 NH₄⁺(aq) → 2 NH₃(aq) + Mn₂O₃(s) + Zn²⁺(aq) + H₂O(l)
B) 2 NiO(OH) (s) + Cd(s) + 2 H₂O(l) → 2 Ni(OH) ₂(s) + Cd(OH) ₂(s)
C) Pb(s) + PbO₂(s) + 2 H⁺(aq) + 2 HSO₄^-(aq) → 2 PbSO₄(s) + 2 H₂O(l)
D) Zn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s)