1) S+Fe=FeS -X1
2) FeS+2HCL=FeCL2+H2S
3) 2H2S+3O2=2SO2+2H2O -X2
4) SO2+Na2O=Na2SO3
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Answers & Comments
1) S+Fe=FeS -X1
2) FeS+2HCL=FeCL2+H2S
3) 2H2S+3O2=2SO2+2H2O -X2
4) SO2+Na2O=Na2SO3