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1) S + O₂ = SO₂
2) 2 SO₂ + O₂ = 2 SO₃
3) SO₃ + CuO = CuSO₄
4) CuSO₄ + Mg = MgSO₄ + Cu
5) SO₂ + H₂O = H₂SO₃
6) SO₃ + H₂O = H₂SO₄