a: \(2HCl\rightarrow H_2+Cl_2\)
\(Cl_2+2FeCl_2\rightarrow2FeCl_3\)
\(FeCl_3+NaOH\rightarrow NaCl+Fe\left(OH\right)_3\downarrow\)
\(NaCl+H_2SO_4\left(đặc\right)\rightarrow NaHSO_4+HCl\)
\(2HCl+CuO\rightarrow CuCl_2+H_2O\)
\(CuCl_2+2AgNO_3\rightarrow2AgCl\downarrow+Cu\left(NO_3\right)_2\)
\(2AgCl\rightarrow2Ag+Cl_2\)
b: \(NaOH+HCl\rightarrow NaCl+H_2O\)
\(NaCl+H_2SO_4\left(đặc\right)\rightarrow NaHSO_4+HCl\)
\(2HCl\rightarrow H_2+Cl_2\)
\(Cl_2+H_2\rightarrow2HCl\left(t^0\right)\)
\(2HCl+CuO\rightarrow H_2O+CuCl_2\)
\(CuCl_2+2KOH\rightarrow Cu\left(OH\right)_2\downarrow+2KCl\)
\(KCl+H_2O\rightarrow KOH+Cl_2+H_2\)
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