Em tham khảo nha :
\(\begin{array}{l}
8)\\
B\\
Fe + {H_2}S{O_4} \to FeS{O_4} + {H_2}\\
9)\\
C\\
S{O_2} + {H_2}O \to {H_2}S{O_3}\\
N{a_2}O + {H_2}O \to 2NaOH\\
C{O_2} + {H_2}O \to {H_2}C{O_3}\\
{K_2}O + {H_2}O \to 2KOH\\
10)\\
A\\
CuO + 2HCl \to CuC{l_2} + {H_2}O\\
{K_2}O + 2HCl \to 2KCl + {H_2}O\\
N{a_2}O + 2HCl \to 2NaCl + {H_2}O\\
ZnO + 2HCl \to ZnC{l_2} + {H_2}O\\
11)\\
D\\
S{O_2} + 2KOH \to {K_2}S{O_3} + {H_2}O\\
{P_2}{O_5} + 6KOH \to 2{K_3}P{O_4} + 3{H_2}O\\
C{O_2} + 2KOH \to {K_2}C{O_3} + {H_2}O\\
S{O_3} + 2KOH \to {K_2}S{O_4} + {H_2}O\\
12)\\
C\\
S{O_3} + {H_2}O \to {H_2}S{O_4}\\
13)\\
D
\end{array}\)