What is the overall reaction in a mercury ll during discharge?
Anode: Zn(Hg) + 2OH- -> ZnO(s) + Hâ‚‚O + 2e- . Cathode: HgO + Hâ‚‚O + 2e- -> Hg(l) + 2OH- . Overall: Zn(Hg) + HgO(s) -> ZnO(s) + Hg(l) . This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Relevant Chemistry topic covering principles and examples as per NCERT.