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2�� SO₂��

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4FeS₂+11O₂=2Fe₂O₃+8SO₂

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CaCO₃=CaO+CO₂

2CaO+2SO₂+O₂= CaSO₄

CaO+H₂S=CaSO₄+H₂O

CaCO₃+H₂S=CaS+H₂O+CO₂

CaS+2O₂= CaSO₄

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