Hydrogen chloride gas is prepared in the laboratory using concentrated sulphuric acid and sodium chloride. Answer the question that follow based on this reaction :
How is the gas collected ?

Explanation

To collect hydrogen chloride (HCl) gas prepared from the reaction of concentrated sulfuric acid (H2SO4) and sodium chloride (NaCl), follow these steps:

### Step-by-Step Solution:

1. **Preparation of HCl Gas**:
- Mix concentrated sulfuric acid with sodium chloride in a suitable reaction vessel. The reaction can be represented as:
\[
\text{NaCl (s) + H}_2\text{SO}_4\text{ (l)} \rightarrow \text{NaHSO}_4\text{ (s) + HCl (g)}
...