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Which of the following oxoacids of phosphorus has strongest reducing property?

1. H3PO4
2. H4P2O7
3. H3PO3
4. H3PO2

Correct answer: H3PO2

Solution

H3PO2 (hypophosphorous acid) has the strongest reducing property because it contains one P-H bond, which is responsible for its reducing nature. Other oxoacids lack such P-H bonds.

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