C-10-Q072mediumsingle_mcqCathode reaction in aluminium electrolysis is—a2Al3++6e−→2Al\mathrm{2Al^{3+} + 6e^- \to 2Al}2Al3++6e−→2Alb6O2−→3O2+12e−\mathrm{6O^{2-} \to 3O_2 + 12e^-}6O2−→3O2+12ecAl→Al3++3e−\mathrm{Al \to Al^{3+} + 3e^-}Al→Al3++3e−dNa++e−→Na\mathrm{Na^+ + e^- \to Na}Na++e−→Na