a. NaOH
b. NaOH
\(\left\{{}\begin{matrix}\left[{}\begin{matrix}2NaOH+CO_2--->Na_2CO_3+H_2O\\NaOH+CO_2--->NaHCO_3\end{matrix}\right.\\\left[{}\begin{matrix}2NaOH+SO_2--->Na_2SO_3+H_2O\\NaOH+SO_2--->NaHSO_3\end{matrix}\right.\end{matrix}\right.\)
c. NaOH, Cu(OH)2, Fe(OH)3
\(\left\{{}\begin{matrix}2NaOH+H_2SO_4--->Na_2SO_4+2H_2O\\Cu\left(OH\right)_2+H_2SO_4--->CuSO_4+2H_2O\\2Fe\left(OH\right)_3+3H_2SO_4--->Fe_2\left(SO_4\right)_3+6H_2O\end{matrix}\right.\)
d. Cu(OH)2, Fe(OH)3
\(\left\{{}\begin{matrix}Cu\left(OH\right)_2\overset{t^o}{--->}CuO+H_2O\\2Fe\left(OH\right)_3\overset{t^o}{--->}Fe_2O_3+3H_2O\end{matrix}\right.\)
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