Question

How can you prepare Cl₂ from HCl and HCl from Cl₂? Write reactions only.

Answer 1

Cl₂ can be prepared from HCl by Deacon’s process.

HCl can be prepared from Cl₂ on treating it with water.

${\displaystyle C{l}_2+H_{2}O\to HCl + HOCl}$

                     Hydrochloric acid         Hypochlorous acid

Answer 2

${\displaystyle Mn{O}_2+4HCl\to MnC{l}_2+C{l}_2+2H_{2}O}$

Oxidising agent

We can also used ${\displaystyle KMn{O}_4,K_{2}C{r}_2{O}_7}$, etc in place of ${\displaystyle Mn{O}_2}$