4 K + O2 → 2 K₂O
2 Mg + O2 → 2 MgO
N2 + O2 → 2 NO
Cr + 3 O2 → 2 Cr₂O₃
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4 K + O2 → 2 K₂O
2 Mg + O2 → 2 MgO
N2 + O2 → 2 NO
Cr + 3 O2 → 2 Cr₂O₃