Hydrogen burns in air with a pop sound. This property is used as a test for hydrogen.

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Hydrogen's Property**:
- Hydrogen is a colorless, odorless gas that is highly flammable. When it burns in the presence of oxygen (from the air), it produces water vapor and releases energy.

2. **Conducting the Test**:
- To test for the presence of hydrogen gas, you can use a simple experiment. Take a test tube filled with hydrogen gas.

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