$\begin{gathered} (1)NaC{l_{tt}} + {H_2}S{O_{{4_d}}}\xrightarrow{{ \geqslant {{400}^o}C}}N{a_2}S{O_4} + HCl \hfill \\(2)Mn{O_2} + 4HC{l_d}\xrightarrow{{{t^o}}}MnC{l_2} + C{l_2} + 2{H_2}O \hfill \\(3)C{l_2} + {H_2}S \to 2HCl + S \downarrow \hfill \\ (4)S + {H_2}\xrightarrow{{{t^o}}}{H_2}S \hfill \\ (5){H_2}S + 2NaOH \to N{a_2}S + 2{H_2}O \hfill \\ (6)N{a_2}S + 3{H_2}S{O_4} \to 2NaHS{O_4} + S{O_2} + 2{H_2}O + S \hfill \\ (7)S{O_2} + {H_2}{O_2} \to {H_2}S{O_4} \hfill \\ (8){H_2}S{O_4} + BaC{l_2} \to BaS{O_4} \downarrow + {H_2}O \hfill \\ \end{gathered}$