Co⁺² (solid cobalt) electrode increases in mass during cell operation.
The half reaction of overall reaction in which reactant loses electrons during the reaction is called Oxidation Half Reaction.
The half reaction of overall reaction in which reactants gains its electrons during the reaction is called Reduction half reaction.
Co⁺² + 2e⁻ ⇌ Co(s) E° = -0.28
Zn⁺² + 2e− ⇌ Zn(s) E° = -0.7618
Thus from the above conclusion we can say that Co⁺² (solid cobalt) electrode increases in mass during cell operation.
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