S + O2 = SO2
Na2O + SO2 = Na2SO3
Na2SO3 + H2SO4 = SO2 + Na2SO4 + H2O
Na2SO3 + Ba(OH)2 = BaSO3 + 2NaOH
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Verified answer
S + O2 = SO2
Na2O + SO2 = Na2SO3
Na2SO3 + H2SO4 = SO2 + Na2SO4 + H2O
Na2SO3 + Ba(OH)2 = BaSO3 + 2NaOH