a)
\(2KMn{O_4} + 16HCl\xrightarrow{{}}2KCl + 2MnC{l_2} + 5C{l_2} + 8{H_2}O\)
\(C{l_2} + 2KBr\xrightarrow{{}}2KCl + B{r_2}\)
\(S{O_2} + B{r_2} + 2{H_2}O\xrightarrow{{}}{H_2}S{O_4} + 2HBr\)
\(Cu + 2{H_2}S{O_4}\xrightarrow{{{t^o}}}CuS{O_4} + S{O_2} + 2{H_2}O\)
\(2{H_2}S + S{O_2}\xrightarrow{{{t^o}}}3S + 2{H_2}O\)
\(2{H_2}S + 3{O_2}\xrightarrow{{{t^o}}}2S{O_2} + 2{H_2}O\)
\(NaOH + S{O_2}\xrightarrow{{}}NaHS{O_3}\)
\(NaOH + NaHS{O_3}\xrightarrow{{}}N{a_2}S{O_3} + {H_2}O\)
\(N{a_2}S{O_3} + 2HCl\xrightarrow{{}}2NaCl + S{O_2} + {H_2}O\)
b)
\(4Fe{S_2} + 11{O_2}\xrightarrow{{{t^o}}}2F{e_2}{O_3} + 8S{O_2}\)
\(2S{O_2} + {O_2}\xrightarrow{{{V_2}{O_5},{t^o}}}2S{O_3}\)
\({H_2}O + S{O_3}\xrightarrow{{}}{H_2}S{O_4}\)
\(CuO + {H_2}S{O_4}\xrightarrow{{}}CuS{O_4} + {H_2}O\)
\(CuS{O_4} + Ba{(OH)_2}\xrightarrow{{}}BaS{O_4} + Cu{(OH)_2}\)
c)
\(2KMn{O_4}\xrightarrow{{{t^o}}}{K_2}Mn{O_4} + Mn{O_2} + {O_2}\)
\(S + {O_2}\xrightarrow{{{t^o}}}S{O_2}\)
\(S{O_2} + B{r_2} + 2{H_2}O\xrightarrow{{}}{H_2}S{O_4} + 2HBr\)
\(NaC{l_r} + {H_2}S{O_4}\xrightarrow{{{t^o}}}NaHS{O_4} + HCl\)
\(NaOH + HCl\xrightarrow{{}}NaCl + {H_2}O\)
\(NaCl + AgN{O_3}\xrightarrow{{}}AgCl + NaN{O_3}\)
