The following questions are pertaining to the laboratory preparation of hydrogen chloride gas:
How would you check whether or not the gas jar is filled with hydrogen chloride?

Explanation

To check whether the gas jar is filled with hydrogen chloride (HCl) gas, you can follow these steps:

### Step-by-Step Solution:

1. **Gather Materials**: Obtain a test tube, a glass rod, and a solution of ammonium hydroxide (NH4OH).

2. **Prepare the Glass Rod**: Dip the glass rod into the ammonium hydroxide solution to coat it with the solution.

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