Diprotic compound among the following are

Options

A. `H_3PO_3`
B. `H_3PO_2`
C. `HClO_3`
D. `HPO_3`

Answer

To determine which compounds among the given options are diprotic, we need to understand what a diprotic compound is. A diprotic compound is one that can donate two protons (H⁺ ions) in an aqueous solution.

### Step-by-Step Solution:

1. **Identify the Compounds**:
We need to analyze the given compounds to see how many protons they can donate. The compounds mentioned in the video are H₃PO₃, H₃O₂, HClO₃, and H₃O₃⁻.

2. **Analyze H₃PO₃ (Phosphorous Acid)**:
- Structure: H₃PO₃ has three hydrogen atoms.
- Proton Donation: Out of these three, two hydrogen atoms are attached to oxygen (O) and can be released as H⁺ ions. Therefore, H₃PO₃ can donate two protons.
- Conclusion: H₃PO₃ is a diprotic compound.

3. **Analyze H₃O₂ (Hypoous Acid)**:
- Structure: H₃O₂ has three hydrogen atoms.
- Proton Donation: Similar to H₃PO₃, it can also donate two protons.
- Conclusion: H₃O₂ is a diprotic compound.

4. **Analyze HClO₃ (Chloric Acid)**:
- Structure: HClO₃ has one hydrogen atom.
- Proton Donation: It can only donate one proton.
- Conclusion: HClO₃ is a monoprotic compound.

5. **Analyze H₃O₃⁻ (Hydronium Ion)**:
- Structure: H₃O₃⁻ has three hydrogen atoms.
- Proton Donation: It can donate only one proton.
- Conclusion: H₃O₃⁻ is a monoprotic compound.

### Final Conclusion:
The diprotic compounds among the given options are **H₃PO₃ and H₃O₂**.