    2 2 BaCl KO S P Q White ppt.        gas HCl Carbon S R     The — AITS & Test Series Chemistry Question

Question

    2 2 BaCl KO S P Q White ppt.        gas HCl Carbon S R     The unknown compounds P, Q, R and S in the above reaction sequence are respectively (A) K2SO3, BaSO3, BaS, H2S (B) K2S, BaS, CS2, H2S (C) K2SO4, BaSO4, BaS, H2S (D) K2SO4, BaSO4, BaCO3, CO2