Ca + S = CaS \ 0 → +2
2FeCl3 + Fe = 3FeCl2 \ +3 → +2
2Al + Fe2O3 = Al2O3 + Fe \ 0 → +3
2Al + 2NaOH = 2NaAlO2 + H2 \ 0 → +3
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Ca + S = CaS \ 0 → +2
2FeCl3 + Fe = 3FeCl2 \ +3 → +2
2Al + Fe2O3 = Al2O3 + Fe \ 0 → +3
2Al + 2NaOH = 2NaAlO2 + H2 \ 0 → +3