`H_2SO_4` is always diluted by adding it to water but not by adding water to it. Justify.

Explanation

### Step-by-Step Solution:

1. **Understanding the Nature of Sulfuric Acid (H₂SO₄)**:
- Sulfuric acid is a strong acid and highly exothermic when mixed with water. This means that it releases a significant amount of heat during the dilution process.

2. **Dilution Process**:
- When diluting sulfuric acid, the correct method is to add sulfuric acid to water, not the other way around. This is because adding water to concentrated sulfuric acid can lead to dangerous reactions.

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