How can you prepare `Cl_2` from HCl and HCI from `Cl_2`? Write reactions only.

Explanation

To prepare \( Cl_2 \) from \( HCl \) and \( HCl \) from \( Cl_2 \), we can follow these reactions:

### Step 1: Preparing \( Cl_2 \) from \( HCl \)

The preparation of chlorine gas (\( Cl_2 \)) from hydrochloric acid (\( HCl \)) can be done using the Deacon's process. The reaction is as follows:

\[
4 HCl(g) + O_2(g) \xrightarrow{CuCl_2, 723 K} 2 Cl_2(g) + 2 H_2O(g)
...