Which of the following statements regarding boric acid is false?

Options

A. It acts as a tribasic acid
B. It has a planar structure
C. It acts as a monobasic acid
D. It is soluble is hot water

Answer

To determine which statement regarding boric acid is false, we will analyze each statement one by one.

### Step 1: Analyze the Statements
1. **It acts as a tribasic acid.**
2. **It has a planar structure.**
3. **It acts as a monobasic acid.**
4. **It is soluble in hot water.**

### Step 2: Understanding Boric Acid
Boric acid has the chemical formula \( H_3BO_3 \) or can be represented as \( B(OH)_3 \).

### Step 3: Evaluate Each Statement

1. **Tribasic Acid:**
- A tribasic acid can donate three protons (H⁺ ions). However, boric acid does not behave as a tribasic acid. It can only donate one proton in a reaction. Therefore, this statement is **false**.

2. **Planar Structure:**
- The structure of boric acid is indeed planar. The boron atom is at the center with three hydroxyl (OH) groups arranged around it in a triangular planar geometry. This statement is **true**.

3. **Monobasic Acid:**
- Boric acid acts as a monobasic acid because it can donate only one proton (H⁺) in solution. This statement is **true**.

4. **Soluble in Hot Water:**
- Boric acid is soluble in hot water. This statement is also **true**.

### Conclusion
The false statement regarding boric acid is that it acts as a tribasic acid. Therefore, the answer is:

**False Statement:** It acts as a tribasic acid.

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