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��CaSO₃→CaO+CO₂

��CaO+CO₂→CaSO₃

��CaO+SO₂+1/2O₂→CaSO₄

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��CaO+H2O→Ca(OH)₂

��SO₂+H₂O→H₂SO₃

��Ca(OH)₂+H₂SO₃→CaSO₃+2H₂O

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