SO2 → Na2SO3 → NaHSO3 → SO2 → Na2SO4
1)SO2+2NaOH=Na2SO3+H2O
2)Na2SO3+H2O+SO2=2NaHSO3
3)NaHSO3+HCL=NaCl+SO2+H2O
4)2SO2+H2O=2H2SO4
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Verified answer
1)SO2+2NaOH=Na2SO3+H2O
2)Na2SO3+H2O+SO2=2NaHSO3
3)NaHSO3+HCL=NaCl+SO2+H2O
4)2SO2+H2O=2H2SO4