`H_(3)BO_(3)` is.

Options

A. Monobasic and weak Lewis acid
B. Monobasic and weak Bronsted acid
C. Monobasic and strong Lewis acid
D. Tribasic and weak Bronsted acid.

Explanation

To determine the nature of \( H_3BO_3 \) (Boric acid), we can analyze its properties step by step.

### Step 1: Identify the Structure of \( H_3BO_3 \)
- Boric acid, \( H_3BO_3 \), consists of a boron atom (B) surrounded by three hydroxyl groups (–OH). The molecular structure can be represented as \( B(OH)_3 \).

**Hint:** Look at the molecular structure to understand how the atoms are arranged and bonded.

### Step 2: Determine the Acidic Nature
- Boric acid is classified as a weak acid. It does not dissociate completely in water, which is a characteristic of weak acids. Instead, it can donate protons (H⁺) in a limited manner.

**Hint:** Consider how the acid behaves in water to determine if it is strong or weak.

### Step 3: Classify as a Lewis Acid
- The boron atom in \( H_3BO_3 \) is electron-deficient, meaning it can accept a pair of electrons. This property classifies it as a Lewis acid.

**Hint:** Recall the definition of Lewis acids and bases to identify the acid's behavior regarding electron pairs.

### Step 4: Determine the Basicity
- Boric acid can accept only one hydroxide ion (OH⁻) to form the tetrahydroxyborate ion \( [B(OH)_4]^− \). This indicates that it can only donate one proton, making it a monobasic acid.

**Hint:** Think about how many protons the acid can donate in a reaction to assess its basicity.

### Step 5: Conclusion
- Based on the analysis, \( H_3BO_3 \) is classified as a **monobasic weak Lewis acid**.

**Final Answer:** \( H_3BO_3 \) is a monobasic weak Lewis acid.