When hydrogen is premixed with air or oxygen, it explodes with a ____ sound.

Explanation

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

1. **Understanding the Reaction**: When hydrogen gas (H₂) is mixed with oxygen (O₂) or air, it undergoes a combustion reaction. The chemical equation for this reaction is:
\[ 2H_2 + O_2 \rightarrow 2H_2O + \text{Energy} \]
Here, hydrogen reacts with oxygen to form water (H₂O) and releases energy in the process.

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