\(a,\left(1\right)2Fe+3Cl_2\rightarrow\left(t^o\right)2FeCl_3\\ \left(2\right)FeCl_3+3KOH\rightarrow Fe\left(OH\right)_3+3KCl\\ \left(3\right)2Fe\left(OH\right)_3\rightarrow\left(t^o\right)Fe_2O_3+3H_2O\\ \left(4\right)Fe_2O_3+H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\\ \left(5\right)Fe_2\left(SO_4\right)_3+3BaCl_2\rightarrow3BaSO_4+2FeCl_3\)
d,
\(\left(1\right)2Al_2O_3\rightarrow\left(đpnc,xt\right)4Al+3O_2\\ \left(2\right)2Al+6HCl\rightarrow2AlCl_3+3H_2\\ \left(3\right)AlCl_3+3NaOH\rightarrow Al\left(OH\right)_3+3NaCl\\ \left(4\right)NaCl+H_2O\rightarrow\left(đpddcmnx\right)NaOH+\dfrac{1}{2}Cl_2+\dfrac{1}{2}H_2\\ \left(5\right)2NaOH+CuCl_2\rightarrow Cu\left(OH\right)_2+2NaCl\)
\(c,\\ 2Cu+O_2\rightarrow\left(t^o\right)2CuO\\ \left(2\right)CuO+2HCl\rightarrow CuCl_2+H_2O\\ \left(3\right)CuCl_2+2KOH\rightarrow Cu\left(OH\right)_2+2KCl\\ \left(4\right)Cu\left(OH\right)_2\rightarrow\left(t^o\right)CuO+H_2O\\ \left(5\right)CuO+CO\rightarrow\left(t^o\right)Cu+CO_2\\ \left(6\right)Cu+2H_2SO_{4\left(đ\right)}\rightarrow\left(t^o\right)CuSO_4+SO_2+2H_2O\)
\(b,\\ \left(1\right)Fe+2HCl\rightarrow FeCl_2+H_2\\ \left(2\right)FeCl_2+2AgNO_3\rightarrow Fe\left(NO_3\right)_2+2AgCl\\ \left(3\right)Fe\left(NO_3\right)_2+2KOH\rightarrow Fe\left(OH\right)_2+2KNO_3\\ \left(4\right)Fe\left(OH\right)_2+H_2SO_4\rightarrow FeSO_4+2H_2O\)
