Câu 3: a-. HCl → Cl2 → FeCl3 → NaCl → HCl → CuCl2 → AgCl b-. KMnO4 → Cl2 → HCl → FeCl2 → AgCl → Cl2 → Br2 → I2 → ZnI2 c- Cl2 → NaCl → Cl2 → CaOCl2 d- F2 → CaF2 → HF → SiF4 e- CaCO3 → CaCl2 → NaCl → NaOH → NaClO → NaClO3 .
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