Conc. `H_2 SO_4` is diluted

Options

A. By adding water in `H_(2)SO_(4)`
B. By adding `H_(2)SO_(4)` in water
C. By adding glacial acid in `H_(2)SO_(4)`
D. None of the above

Explanation

To solve the question regarding the dilution of concentrated sulfuric acid (H₂SO₄), we need to analyze the options provided and understand the proper method for dilution.

### Step-by-Step Solution:

1. **Understanding the Options**:
- The options given are:
1. Adding water to H₂SO₄
2. Adding H₂SO₄ to water
3. Adding glacial acetic acid to H₂SO₄
4. None of the above

2. **Analyzing the First Option (Adding Water to H₂SO₄)**:
- If we add water directly to concentrated H₂SO₄, it can lead to a violent exothermic reaction. This reaction can produce heat and potentially cause the mixture to splatter or even explode due to the rapid generation of steam. Therefore, this method is not safe.

3. **Analyzing the Second Option (Adding H₂SO₄ to Water)**:
- This method is the correct and safe way to dilute sulfuric acid. When concentrated H₂SO₄ is added to water, the heat generated is absorbed by the water, reducing the risk of splattering. This process is also known as "acid to water" and is the recommended practice in laboratories.

4. **Analyzing the Third Option (Adding Glacial Acetic Acid to H₂SO₄)**:
- Glacial acetic acid is a different substance and does not serve the purpose of diluting sulfuric acid. Mixing glacial acetic acid with concentrated H₂SO₄ does not yield a diluted solution of sulfuric acid and could lead to the formation of unwanted products.

5. **Analyzing the Fourth Option (None of the Above)**:
- Since we have identified that the second option is the correct method for dilution, this option is incorrect.

6. **Conclusion**:
- The best method for diluting concentrated sulfuric acid is to add H₂SO₄ to water. Therefore, the correct answer is **Option 2**.

### Final Answer:
**The correct method to dilute concentrated H₂SO₄ is to add H₂SO₄ to water (Option 2).**

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