Bài 2: Hoàn thành sơ đồ chuyển hóa:
1. KMnO4 → O2 → SO2 → S -> FeS ->H2S → SO2 ->SO3 -> H2SO4 ->CuSO4 -> Cu(OH)2 -> CuO
2. FeS2 → SO2 → H2SO3 → K2SO3 → SO2 → S → H2S-> FeS ->Fe2(SO4)3 ->FeCl3
3. FeS2-> SO2-> HBr ->NaBr -> Br2 -> i2
SO3 ->H2SO4-> KHSO4 ->K2SO4-> KCl
->KNO3