1. O2 + 4Cu = 2Cu2O
2. N2 + O2 = 2NO
3. 4Fe + 3O2 = 2Fe2O3
4. S + O2 = SO2
5. 4As + 5O2 = 2As2O5
6. 2Cr + 3O2 = 2CrO3
7. 4Mn + 7O2 = 2Mn2O7
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1. O2 + 4Cu = 2Cu2O
2. N2 + O2 = 2NO
3. 4Fe + 3O2 = 2Fe2O3
4. S + O2 = SO2
5. 4As + 5O2 = 2As2O5
6. 2Cr + 3O2 = 2CrO3
7. 4Mn + 7O2 = 2Mn2O7