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Which of the following statements is not valid for oxoacids of phosphorus?

1. Orthophosphoric acid is used in the manufacture of triple superphosphate.
2. Hypophosphorous acid is a diprotic acid.
3. All oxoacids contain tetrahedral four coordinated phosphorus.
4. All oxoacids contain at least one P=O and one P—OH group.

Correct answer: Hypophosphorous acid is a diprotic acid.

Solution

Hypophosphorous acid (H3PO2) is a monoprotic acid, not diprotic, as it has only one ionizable hydrogen atom attached to oxygen.

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