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3C(s) + 4Al^3+ (l) + 6O^2- ---> 4Al + 3CO2
2. reaksi redoks pada penyambungan besi
2Al (s) + Fe2O3 ---> 2Fe + Al2O3
3. reaksi redoks pada baterai
anoda: Zn + 2 OH-→ZnO + H2O + 2e
katoda: 2MnO2+ H2O + 2e-→Mn2O3+ 2OH-