Though phosphorus acid contains three hydrogen molecules, it is a dibasic acid. Give reasons.

Explanation

**Step-by-Step Solution:**

1. **Understanding Phosphorus Acid**: Phosphorus acid has the chemical formula H₃PO₃. It contains three hydrogen atoms.

2. **Identifying Ionizable Hydrogens**: In phosphorus acid, not all hydrogen atoms are ionizable. Only the hydrogen atoms that are bonded to oxygen can release H⁺ ions when dissolved in water.

3. **Structure of Phosphorus Acid**: The structure of H₃PO₃ can be represented as:
- Two hydrogen atoms (H) are bonded to oxygen (O) atoms.
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