S-->so-->h_2so_4-->baso_4-->bao

Question

S-->so-->h_2so_4-->baso_4-->bao

Answer 1

S + O2 -> SO2

2SO2 + O2 -> 2SO3

SO3 + H2O -> H2SO4

H2SO4 + BaCl2 -> BaSO4 + 2HCl

BaSO4 -> BaO + SO3