S + H2 -> H2S
H2S + Pb -> PbS + H2
2H2S + SO2 -> 2H2O + 3S
3S + 2Al -> Al2S3
S + O2 -> SO2
SO2 + Na2O -> Na2SO3
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Verified answer
S + H2 -> H2S
H2S + Pb -> PbS + H2
2H2S + SO2 -> 2H2O + 3S
3S + 2Al -> Al2S3
S + O2 -> SO2
SO2 + Na2O -> Na2SO3