Which one of the following is correct statement ?

Options

A. The hydroxides of `Al` is more acidic than that of `B`
B. The hydroxides of `B` is basic while that of `Al` is amphoteric.
C. The hydroxide of `B` is acidic, while that of `Al` is amphoteric
D. The hydroxides of `B` and `Al` are amphoteric.

Answer

To determine the correct statement regarding the hydroxides of boron and aluminum, we need to analyze the properties of the hydroxides formed by these two elements in Group 13 of the periodic table.

### Step-by-Step Solution:

1. **Identify the Elements and Their Group**:
- Boron (B) and Aluminum (Al) are both members of Group 13 (the boron family) of the periodic table.

2. **Understand the Nature of Hydroxides**:
- Hydroxides are compounds that contain the hydroxide ion (OH⁻). The behavior of these hydroxides can be classified as acidic, basic, or amphoteric.

3. **Properties of Boron Hydroxide**:
- Boron typically forms boric acid (H₃BO₃) when reacting with water, which is a weak acid. Therefore, the hydroxide of boron is considered to be acidic.

4. **Properties of Aluminum Hydroxide**:
- Aluminum hydroxide (Al(OH)₃) is amphoteric, meaning it can react both as an acid and a base. It can neutralize acids and bases.

5. **Evaluate the Statements**:
- **Statement 1**: "The hydroxides of Al are more acidic than that of boron."
- This is incorrect because boron forms a weak acid, while aluminum hydroxide is amphoteric.
- **Statement 2**: "The hydroxide of boron is basic while that of Al is amphoteric."
- This is incorrect because boron hydroxide is acidic, not basic.
- **Statement 3**: "The hydroxide of boron is acidic while that of Al is amphoteric."
- This is correct based on our analysis.
- **Statement 4**: "The hydroxides of boron and Al are amphoteric."
- This is incorrect because only aluminum hydroxide is amphoteric; boron hydroxide is acidic.

6. **Conclusion**:
- The correct statement is **Statement 3**: "The hydroxide of boron is acidic while that of Al is amphoteric."

### Final Answer:
The correct statement is: **C. The hydroxide of boron is acidic while that of Al is amphoteric.**