a) 4Cu + O₂ ---> 2Cu₂O b) 2Cu + O₂ ---> 2CuO c) 2Fe + O₂ ---> 2FeO d) 4Fe + 3O₂ ---> 2Fe₂O₃
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a) 4Cu + O₂ ---> 2Cu₂O
b) 2Cu + O₂ ---> 2CuO
c) 2Fe + O₂ ---> 2FeO
d) 4Fe + 3O₂ ---> 2Fe₂O₃