a)

\(2Na + C{l_2}\xrightarrow{{{t^o}}}2NaCl\)

\(2NaCl\xrightarrow{{đpnc}}2Na + C{l_2}\)

\({H_2} + C{l_2}\xrightarrow{{{t^o}}}2HCl\)

\(Mn{O_2} + 4HCl\xrightarrow{{}}MnC{l_2} + C{l_2} + 2{H_2}O\)

\(2NaOH + C{l_2}\overset {} \leftrightarrows NaCl + NaClO + {H_2}O\)

b)

\(Ca{(OH)_2} + C{l_2}\xrightarrow{{}}CaOC{l_2} + {H_2}O\)

\(CaOC{l_2} + C{O_2}\xrightarrow{{}}CaC{{\text{O}}_3} + C{l_2}\)

\(CaC{{\text{O}}_3}\xrightarrow{{{t^o}}}CaO + C{O_2}\)

c)

\(NaOH + HCl\xrightarrow{{}}NaCl + {H_2}O\)

\(NaC{l_r} + {H_2}S{O_4}\xrightarrow{{{t^o}}}NaH{\text{S}}{O_4} + HCl\)

\(F{\text{e + 2HCl}}\xrightarrow{{}}F{\text{e}}C{l_2} + {H_2}\)

\(F{\text{e + 2HCl}}\xrightarrow{{}}F{\text{e}}C{l_2} + {H_2}\)

d)

\(F{\text{e + 2HCl}}\xrightarrow{{}}F{\text{e}}C{l_2} + {H_2}\)

\(B{{\text{r}}_2} + 2NaI\xrightarrow{{}}2NaB{\text{r}} + {I_2}\)

\(2{\text{A}}l + 3{I_2}\xrightarrow{{{t^o}}}2{\text{A}}l{I_3}\)