1) S + O2 = SO2
SO2 + Na2O = Na2So3
2) 2Zn + O2 = 2ZnO
ZnO + 2NaOH = Na2ZnO2 + H2O
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Answers & Comments
1) S + O2 = SO2
SO2 + Na2O = Na2So3
2) 2Zn + O2 = 2ZnO
ZnO + 2NaOH = Na2ZnO2 + H2O