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2.3.15
2Cu + O₂---->2CuO
2Cu + S---->Cu₂S
Cu + Cl₂---->CuCl₂
2.3.16
Cr + S---->CrS
2Cr + 3Cl₂---->2CrCl₃
4Cr + 3O₂---->2Cr₂O₃
2.3.17
O₂ + 2Mg---->2MgO
O₂ + S---->SO₂
2O₂ + 3Fe---->Fe₃O₄