With respect to the laboratory preparation of hydrochloric acid answer the following question :
Which method is used to collect hydrogen chloride gas ?

Explanation

To answer the question regarding the method used to collect hydrogen chloride gas during its laboratory preparation, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Reaction**:
- Hydrochloric acid (HCl) is prepared in the laboratory by reacting sodium chloride (NaCl) with concentrated sulfuric acid (H2SO4). The reaction can be represented as:
\[
\text{NaCl} + \text{H}_2\text{SO}_4 \rightarrow \text{NaHSO}_4 + \text{HCl}
...