1) S+O2=SO2
SO2+2NaOH=Na2SO3+H2O
Na2SO3+H2SO4=Na2SO4+SO2↑+H2O
Na2SO4+BaCl2=2NaCl+BaSO4↓
2) 2H2S+3O2=2H2O+2SO2
2SO2+O2=2SO3
SO3+H2O=H2SO4
2H2SO4(k)+Cu=CuSO4+SO2↑+2H2O
SO2+2CO=S+2CO2
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Answers & Comments
1) S+O2=SO2
SO2+2NaOH=Na2SO3+H2O
Na2SO3+H2SO4=Na2SO4+SO2↑+H2O
Na2SO4+BaCl2=2NaCl+BaSO4↓
2) 2H2S+3O2=2H2O+2SO2
2SO2+O2=2SO3
SO3+H2O=H2SO4
2H2SO4(k)+Cu=CuSO4+SO2↑+2H2O
SO2+2CO=S+2CO2