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 use the following reactions:

### Step 1: Preparation of \( Cl_2 \) from \( HCl \)

The reaction used for the production of \( Cl_2 \) from \( HCl \) is known as the Deacon's process. The balanced chemical equation for this reaction is:

\[
4 HCl + O_2 \rightarrow 2 Cl_2 + 2 H_2O
...