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Which of these oxoacids of phosphorus contains the greatest number of oxygen atoms in its molecular formula?

1. Pyrophosphorous acid
2. Hypophosphoric acid
3. Phosphoric acid
4. Pyrophosphoric acid

Correct answer: Pyrophosphoric acid

Solution

Pyrophosphoric acid H4P2O7 has 7 oxygen atoms, more than phosphoric (4), hypophosphoric H4P2O6 (6) and pyrophosphorous H4P2O5 (5).

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