Đáp án:

Bạn tham khảo lời giải ở dưới nhé!!!

Giải thích các bước giải:

Câu 4:

\(\begin{array}{l}
4Al + 3{O_2} \to 2A{l_2}{O_3}\\
A{l_2}{O_3} + 6HCl \to 2AlC{l_3} + 3{H_2}O\\
AlC{l_3} + 3NaOH \to Al{(OH)_3} + 3NaCl\\
Al{(OH)_3} + 3HN{O_3} \to Al{(N{O_3})_3} + 3{H_2}O\\
Al{(N{O_3})_3} + N{a_3}P{O_4} \to 3NaN{O_3} + AlP{O_4}\\
Al{(OH)_3} + NaOH \to NaAl{O_2} + 2{H_2}O
\end{array}\)

Câu 5:

\(\begin{array}{l}
2Fe + 3C{l_2} \to 2FeC{l_3}\\
FeC{l_3} + 3NaOH \to 3NaCl + Fe{(OH)_3}\\
2Fe{(OH)_3} \to F{e_2}{O_3} + 3{H_2}O\\
F{e_2}{O_3} + 3{H_2}S{O_4} \to F{e_2}{(S{O_4})_3} + 3{H_2}O
\end{array}\)

Câu 6:

\(\begin{array}{l}
F{e_2}{O_3} + 3CO \to 2Fe + 3C{O_2}\\
Fe + 2HCl \to FeC{l_2} + {H_2}\\
FeC{l_2} + 2NaOH \to Fe{(OH)_2} + 2NaCl\\
4Fe{(OH)_2} + {O_2} + 2{H_2}O \to 4Fe{(OH)_3}\\
2Fe{(OH)_3} + 3{H_2}S{O_4} \to F{e_2}{(S{O_4})_3} + 6{H_2}O
\end{array}\)

Câu 7:

\(\begin{array}{l}
S{O_2} + 2NaOH \to N{a_2}S{O_3} + {H_2}O\\
N{a_2}S{O_3} + 2HCl \to 2NaCl + S{O_2} + {H_2}O\\
S{O_2} + \dfrac{1}{2}{O_2} \to S{O_3}\\
S{O_3} + {H_2}O \to {H_2}S{O_4}\\
2Na + {H_2}S{O_4} \to N{a_2}S{O_4} + {H_2}\\
N{a_2}S{O_4} + Ba{(OH)_2} \to BaS{O_4} + 2NaOH
\end{array}\)

Câu 8:

\(\begin{array}{l}
2Fe{(OH)_3} \to F{e_2}{O_3} + 3{H_2}O\\
F{e_2}{O_3} + 3CO \to 2Fe + 3C{O_2}\\
Fe + {H_2}S{O_4} \to FeS{O_4} + {H_2}\\
FeS{O_4} + 2NaOH \to Fe{(OH)_2} + N{a_2}S{O_4}\\
Fe{(OH)_2} \to FeO + {H_2}O\\
FeO + {H_2} \to Fe + {H_2}O
\end{array}\)