Which of the following statements is/are correct

Options

A. Boric acid is a hydrogen bonded molecule
B. `Al_2O_(3)` is amphoteric while `B_(2)O_(3)` is acidic
C. Boric acid can combine with CuO to give metaborate and borax bead test
D. Boric acid is a lewis acid

Explanation

To determine which statements about boric acid and its properties are correct, we will analyze each statement step by step.

### Step 1: Analyze the first statement
**Statement:** Boric acid is a hydrogen-bonded molecule.

**Explanation:**
Boric acid (H₃BO₃) can form hydrogen bonds due to the presence of hydroxyl (–OH) groups. The oxygen in these groups is more electronegative than hydrogen, allowing for hydrogen bonding between molecules. Therefore, this statement is **correct**.

### Step 2: Analyze the second statement
**Statement:** Al₂O₃ is amphoteric while B₂O₃ is acidic.

**Explanation:**
Aluminum oxide (Al₂O₃) exhibits amphoteric behavior, meaning it can react with both acids and bases. On the other hand, boron trioxide (B₂O₃) is indeed acidic in nature. Thus, this statement is also **correct**.

### Step 3: Analyze the third statement
**Statement:** Boric acid can combine with CO to give metaborate and borax.

**Explanation:**
Boric acid can react with carbon monoxide (CO) to form metaborate and borax. The reaction can be represented as:
\[ \text{H}_3\text{BO}_3 + 3\text{CO} \rightarrow \text{Cu}_2\text{B}_2\text{O}_5 + \text{other products} \]
This statement is **correct** as it describes a valid chemical reaction.

### Step 4: Analyze the fourth statement
**Statement:** Boric acid is a Lewis acid.

**Explanation:**
Boric acid acts as a Lewis acid because boron has an incomplete octet and can accept electron pairs. This property allows it to act as an electron pair acceptor in chemical reactions. Therefore, this statement is also **correct**.

### Conclusion
After analyzing all the statements, we find that:
- **All statements are correct.**

### Final Answer:
All the statements provided are correct.

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