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Which of the following statements are correct statement(s) about pyrophosphoric acid \( \left(\boldsymbol{H}_{4} \boldsymbol{P}_{2} \boldsymbol{O}_{7}\right) \) ? This question has multiple correct options

1. It contains P in +5 oxidation state
2. It is dibasic acid
3. It is a reducing agent
4. It contains one P-O-P bond

Correct answer: It contains one P-O-P bond

Solution

Pyrophosphoric acid has the structure HO–P(=O)(OH)–O–P(=O)(OH)–OH, so it contains exactly one P–O–P bridge. The phosphorus atoms are in the +5 oxidation state, and the acid is tetrabasic rather than dibasic, so the only correct statement given is the one about the P–O–P bond.

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