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Which of the following oxy-acids has the maximum number of hydrogens directly attached to phosphorus?

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

Correct answer: H3PO2

Solution

In H3PO2 (hypophosphorous acid), there are two hydrogens directly bonded to phosphorus, which is the maximum among the given options. The other acids have fewer or no hydrogens directly attached to phosphorus.

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