2H₂S + 3O₂ --> 2SO₂ + 2H₂O
SO₂ + 2NaOH --> Na₂SO₃ + H₂O
Na₂SO₃ + 2HNO₃конц --> Na₂SO₄ + 2NO₂ + H₂O
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2H₂S + 3O₂ --> 2SO₂ + 2H₂O
SO₂ + 2NaOH --> Na₂SO₃ + H₂O
Na₂SO₃ + 2HNO₃конц --> Na₂SO₄ + 2NO₂ + H₂O