H2S->S->SO2->Na2SO4->BaSO4

Question

H2S->S->SO2->Na2SO4->BaSO4

Answer 1

S+O2=S02  

2SO2+ O2=2SO3

H2O +SO3=H2SO4  

2 NaOH + H2SO4= Na2SO4 +H2O

Na2SO4+BaCl2=Baso4 +2NaCl