Question

S->SO2->H2SO3->H2SO4->ZnSO4->ZnS->H2S->SO2->SO3->H2SO4-> BaSO4

Answer 1

S+O2=SO2

SO2+H2O=H2SO3

H2SO4+2NaOH=Na2SO4+2H2O

5H2SO4+4Zn=4ZnSO4+H2S+4H2O

 ZnSO4 + Na2S = ZnS + Na2SO4   

ZnS + 2 HCl = ZnCl2 + H2S

2H2S + ЗО2 = 2Н2О + 2SO2

2SO2+O2= 2SO3 

S03+H2O=H2SO4

H2SO4+BaCL2= BaSO4+2HCL