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- t H2 + Cl2 ------>2HCl
- Cl2 + H2O<===> HCl + HClO
- Cl2 + SO2 + 2H2O-----> 2HCl + H2SO4
- NaClrắn + H2SO4 (đặc) ---t-->NaHSO4 + HCl