KO2+SΔ→(A)BaCl2⟶(B)Carbon−−−−→Δ(C)HCI⟶D White ppt. gas
(B) is BaSO4 and (D) is H2S
(A) is BaS and (D) is SO2
(C) is BaS and (D) is SO2
(A) is K2SO3 and (B) is BaS
KO2+SΔ→K2SO4BaCl2⟶BaSO4Carbon−−−−→ΔBaSHCl⟶H2S (A) (B) (C) (D)
BaSO4 and carbon on heating reacts to produce