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In pyrophosphoric acid (H4P2O7), find the number of P-OH bonds and the oxidation state of phosphorus, respectively.

1. five and four
2. five and five
3. four and five
4. four and four

Correct answer: four and five

Solution

H4P2O7 has 4 P-OH bonds (two per P) and phosphorus is in the +5 state in both PO4 units.

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