Orthoboric acid in aqueous medium is

Options

A. Monobasic
B. Dibasic
C. Tribasic
D. All are correct

Answer

To solve the question regarding orthoboric acid in an aqueous medium, we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Chemical Formula**:
Orthoboric acid is represented by the chemical formula H₃BO₃. This is crucial to understanding its properties.

**Hint**: Remember that the chemical formula gives insights into the composition of the compound.

2. **Understand the Nature of Orthoboric Acid**:
Orthoboric acid is often referred to as a weak acid. It does not dissociate completely in water, which is a characteristic of weak acids.

**Hint**: Weak acids do not fully ionize in solution, which affects their behavior in aqueous media.

3. **Determine the Acidic Properties**:
Orthoboric acid can donate protons (H⁺ ions) in solution, but it does this weakly. It can be classified as a tribasic acid because it can theoretically donate three protons, although it does not do so completely.

**Hint**: The term "tribasic" indicates the potential to donate three protons, but consider the extent of dissociation in practice.

4. **Consider the Aqueous Medium**:
In an aqueous solution, orthoboric acid exists primarily in the form of B(OH)₄⁻ ions and H⁺ ions, but it is not a strong acid like HCl or H₂SO₄.

**Hint**: The behavior of acids in water can vary significantly; consider how they interact with water molecules.

5. **Conclude on the Correct Option**:
Based on the properties discussed, the correct answer to the question is that orthoboric acid in aqueous medium is a weak tribasic acid.

**Hint**: When choosing the correct option, look for keywords like "weak" and "tribasic" to guide your answer.

### Final Answer:
Orthoboric acid in aqueous medium is a weak tribasic acid.