Boric acid is prepared from borax by the action of.

Options

A. `HCl`
B. `NaOH`
C. `CO_(2)`
D. `H_(2)SO_(4)`

Explanation

To prepare boric acid from borax, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Borax Composition**:
- Borax is chemically represented as Na₂B₄O₇ (sodium tetraborate).

2. **Reaction with Hydrochloric Acid (HCl)**:
- When borax reacts with hydrochloric acid, the reaction can be written as:
\[ \text{Na}_2\text{B}_4\text{O}_7 + 6\text{HCl} \rightarrow 4\text{H}_3\text{BO}_3 + 2\text{NaCl} + 3\text{H}_2\text{O} \]
- This reaction produces boric acid (H₃BO₃), sodium chloride (NaCl), and water (H₂O).

3. **Consider Other Reagents**:
- **Sodium Hydroxide (NaOH)**:
- When borax reacts with NaOH, it forms sodium metaborate (NaBO₂) and water, not boric acid.
- **Carbon Dioxide (CO₂)**:
- Borax does not directly react with CO₂ to form boric acid.
- **Sulfuric Acid (H₂SO₄)**:
- The reaction with concentrated sulfuric acid can also yield boric acid:
\[ \text{Na}_2\text{B}_4\text{O}_7 + 4\text{H}_2\text{SO}_4 + 5\text{H}_2\text{O} \rightarrow 4\text{H}_3\text{BO}_3 + 2\text{Na}_2\text{SO}_4 \]

4. **Conclusion**:
- The correct reagents that can prepare boric acid from borax are hydrochloric acid (HCl) and sulfuric acid (H₂SO₄).

### Final Answer:
Boric acid is prepared from borax by the action of **HCl** and **H₂SO₄**.

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