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Question:

The number of P−OH bonds and the oxidation state of phosphorus atom in pyrophosphoric acid (H₄P₂O₇) respectively are:

Four and four

Five and four

Four and five

Five and five

Solution:

The number of P−OH bonds in pyrophosphoric acid (H₄P₂O₇) is four.
The oxidation state of the phosphorus atom in H₄P₂O₇, ⇒ 4 × 1 + 2x + 7 × (-2) = 0 ⇒ x = +5
Hence, option A is correct.