4)
\(S + {O_2}\xrightarrow{{{t^o}}}S{O_2}\)
\(S{O_2} + B{r_2} + 2{H_2}O\xrightarrow{{}}{H_2}S{O_4} + 2HBr\)
\(Cu + 2{H_2}S{O_4}\xrightarrow{{{t^o}}}CuS{O_4} + S{O_2} + 2{H_2}O\)
\(2{H_2}S + S{O_2}\xrightarrow{{{t^o}}}3S + 2{H_2}O\)
\(S + 3{F_2}\xrightarrow{{{t^o}}}S{F_6}\)
5)
\(Mn{O_2} + 4HCl\xrightarrow{{}}MnC{l_2} + C{l_2} + 2{H_2}O\)
\(Ca{(OH)_2} + C{l_2}\xrightarrow{{}}CaOC{l_2} + {H_2}O\)
\(2NaOH + C{l_2}\xrightarrow{{}}NaCl + NaClO + {H_2}O\)
\({H_2} + C{l_2}\xrightarrow{{{t^o}}}2HCl\)
\(NaOH + HCl\xrightarrow{{}}NaCl + {H_2}O\)
\(2NaCl\xrightarrow{{đpnc}}2Na + C{l_2}\)
\(C{l_2} + 2NaBr\xrightarrow{{}}2NaCl + B{r_2}\)
\(B{r_2} + 2NaI\xrightarrow{{}}2NaBr + {I_2}\)
\({I_2} + {H_2}\xrightarrow{{{t^o}}}2HI\)
\(HI + AgN{O_3}\xrightarrow{{}}AgI + HN{O_3}\)
