2H2S + SO2 -> 3S + 2H2O
S + O2 -> SO2
SO2 + Na2O -> Na2SO3
Na2SO3 + 2HCI -> 2NaCl + H2O + SO2
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2H2S + SO2 -> 3S + 2H2O
S + O2 -> SO2
SO2 + Na2O -> Na2SO3
Na2SO3 + 2HCI -> 2NaCl + H2O + SO2