Em tham khảo nha:
\(\begin{array}{l}
1)\,B.\,N{a_2}O + 2HCl \to 2NaCl + {H_2}O\\
2)\,A\\
{K_2}S{O_3} + {H_2}S{O_4} \to {K_2}S{O_4} + S{O_2} + {H_2}O\\
3)\\
(1)S + {O_2} \xrightarrow{t^0} S{O_2}\\
(2)\,S{O_2} + {H_2}O \to {H_2}S{O_3}\\
(3)\,{H_2}S{O_3} + 2NaOH \to N{a_2}S{O_3} + 2{H_2}O\\
(4)\,N{a_2}S{O_3} + 2HCl \to 2NaCl + S{O_2} + {H_2}O\\
4)\\
N{a_2}O + {H_2}O \to 2NaOH\\
2NaOH + S{O_2} \to N{a_2}S{O_3} + {H_2}O\\
N{a_2}S{O_3} + 2HCl \to 2NaCl + S{O_2} + {H_2}O\\
S{O_2} + Ca{(OH)_2} \to CaS{O_3} + {H_2}O
\end{array}\)