This question has multiple parts. Work all the parts to get the most points.A mercury battery used for hearing aids and electric watches delivers a constant voltage for long periods. The half⁻reactions are
HgO(s)+H₂O(l)+2e⁻→Hg(l)+2OH⁻(aq)
Cd(s)+2OH⁻(aq)→Cd(OH)₂(s)+2e⁻
Which half⁻reaction occurs at the anode?
a. HgO(s)+H₂O(l)+2e⁻→Hg(l)+2OH⁻(aq)
b. Cd(s)+2OH⁻(aq)→Cd(OH)₂(s)+2e⁻