Question

The basicity of H$_3$PO$_2$, H$_3$PO$_3$, H$_3$PO$_4$ respectively is

• A. 2, 2, 3
• B. 2, 3, 3
• C. 1, 3, 3
• D. 1, 2, 3

Hint:

The basicity of an acid is determined by the number of replaceable hydrogen ions (protons) in the molecule. The more hydroxyl groups attached to the central atom, the higher the basicity.

Answer 1

The Correct Option is D

Basicity of Phosphorus Oxoacids Analysis

• \( \text{H}_3\text{PO}_2 \) (Hypophosphorous acid): It has one hydroxyl group attached to the phosphorus atom, so its basicity is 1.
• \( \text{H}_3\text{PO}_3 \) (Phosphorous acid): It has two hydroxyl groups attached to the phosphorus atom, so its basicity is 2.
• \( \text{H}_3\text{PO}_4 \) (Phosphoric acid): It has three hydroxyl groups attached to the phosphorus atom, so its basicity is 3.

Conclusion:

Therefore, the correct answer is \( \mathbf{1, 2, 3} \).