How will you test that the gas evolved in a reaction is hydrogen.

Explanation

To test if the gas evolved in a reaction is hydrogen, follow these steps:

### Step-by-Step Solution:

1. **Set Up the Experiment**:
- Take a test tube and perform the reaction that is expected to produce gas. Ensure that the test tube is securely held and that any necessary safety precautions are taken.

2. **Observe Gas Evolution**:
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