C-08-Q189mediumsingle_mcqReaction at the cathode in electrolysis of molten alumina:a3 OX2−→OX2+6 eX−\ce{3O^2- -> O2 + 6e-}3OX2−OXb2 AlX3++6 eX−→2 Al\ce{2Al^3+ + 6e- -> 2Al}2AlX3++6ecAl→AlX3++3 eX−\ce{Al -> Al^3+ + 3e-}AlAldAlX2OX3→2 Al+3 O\ce{Al2O3 -> 2Al + 3O}AlX2O