4FeS +7 O2 -> 2Fe2O3 + 4SO2
SO2 + 2NaOH = Na2SO3 + H2O
Na2SO3 + SO2 + H2O = 2NaHSO3
2NaHSO3 -> SO2 + H2O + Na2SO3
SO2 + 2H2S = 3S + 2H2O
S + Cl2 -> SCl2
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4FeS +7 O2 -> 2Fe2O3 + 4SO2
SO2 + 2NaOH = Na2SO3 + H2O
Na2SO3 + SO2 + H2O = 2NaHSO3
2NaHSO3 -> SO2 + H2O + Na2SO3
SO2 + 2H2S = 3S + 2H2O
S + Cl2 -> SCl2