Em tham khảo nha:
\(\begin{array}{l}
a)\\
2Cu + {O_2} \xrightarrow{t^0} 2CuO\\
CuO + {H_2}S{O_4} \to CuS{O_4} + {H_2}O\\
CuS{O_4} + BaC{l_2} \to CuC{l_2} + BaS{O_4}\\
CuC{l_2} + 2NaOH \to Cu{(OH)_2} + 2NaCl\\
Cu{(OH)_2} + 2HN{O_3} \to Cu{(N{O_3})_2} + 2{H_2}O\\
Cu{(N{O_3})_2} + Fe \to Fe{(N{O_3})_2} + Cu\\
b)\\
Fe + 2HCl \to FeC{l_2} + {H_2}\\
FeC{l_2} + 2NaOH \to Fe{(OH)_2} + 2NaCl\\
Fe{(OH)_2} + {H_2}S{O_4} \to FeS{O_4} + 2{H_2}O\\
FeS{O_4} + Ba{(N{O_3})_2} \to Fe{(N{O_3})_2} + BaS{O_4}\\
Mg + Fe{(N{O_3})_2} \to Mg{(N{O_3})_2} + Fe\\
2Fe + 3C{l_2} \xrightarrow{t^0} 2FeC{l_3}\\
FeC{l_3} + 3NaOH \to Fe{(OH)_3} + 3NaCl\\
2Fe{(OH)_3} \to F{e_2}{O_3} + 3{H_2}O\\
F{e_2}{O_3} + 3CO \xrightarrow{t^0} 2Fe + 3C{O_2}\\
3Fe + 2{O_2} \xrightarrow{t^0} F{e_3}{O_4}\\
c)\\
4Al + 3{O_2} \to 2A{l_2}{O_3}\\
A{l_2}{O_3} + 6HCl \to 2AlC{l_3} + 3{H_2}O\\
AlC{l_3} + 3NaOH \to Al{(OH)_3} + 3NaCl\\
2Al{(OH)_3} \xrightarrow{t^0} A{l_2}{O_3} + 3{H_2}O\\
2A{l_2}{O_3} \xrightarrow{dpnc} 4Al + 3{O_2}\\
2Al + 6HCl \to 2AlC{l_3} + 3{H_2}\\
d)\\
2Mg + {O_2} \xrightarrow{t^0} 2MgO\\
MgO + {H_2}S{O_4} \to MgS{O_4} + {H_2}O\\
MgS{O_4} + Ba{(N{O_3})_2} \to Mg{(N{O_3})_2} + BaS{O_4}\\
Mg{(N{O_3})_2} + 2NaOH \to Mg{(OH)_2} + 2NaN{O_3}\\
Mg{(OH)_2} \xrightarrow{t^0} MgO + {H_2}O
\end{array}\)
