Em tham khảo nha:
\(\begin{array}{l}
a)\\
2Fe{(OH)_3} + 3{H_2}S{O_4} \to F{e_2}{(S{O_4})_3} + 6{H_2}O\\
2KOH + {H_2}S{O_4} \to {K_2}S{O_4} + 2{H_2}O\\
Ba{(OH)_2} + {H_2}S{O_4} \to BaS{O_4} + 2{H_2}O\\
b)\\
KOH,Ba{(OH)_2}\\
c)\\
2Fe{(OH)_3} \xrightarrow{t^0} F{e_2}{O_3} + 3{H_2}O\\
d)\\
2KOH + S{O_2}\, \to {K_2}S{O_3} + {H_2}O\\
Ba{(OH)_2} + S{O_2} \to BaS{O_3} + {H_2}O
\end{array}\)