Zinc electrode (anode): Zn(s) → Zn2+(aq) + 2e-

Carbon electrode (cathode): 2MnO2(s) + 2NH4Cl(aq) + 2e- → Mn2O3(s) + 2NH3(g) + H2O(l)

Overall reaction: Zn(s) + 2MnO2(s) + 2NH4Cl(aq) → Zn2+(aq) + Mn2O3(s) + 2NH3(g) + H2O(l)

In this reaction, zinc metal is oxidized (loses electrons) at the anode, while manganese dioxide is reduced (gains electrons) at the cathode.