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Chemistry · Group 13 to Group 18 Elements

Which of the following statements are correct statement(s) about pyrophosphoric

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

  • A. It contains P in +5 oxidation state
  • B. It is dibasic acid
  • C. It is a reducing agent
  • D. It contains one P-O-P bond

Step-by-step solution

Pyrophosphoric acid (H₄P₂O₇) has a P-O-P linkage. The oxidation state of phosphorus is calculated as: total charge = 0, so 4(+1) + 2x + 7(-2) = 0 → 2x = 10 → x = +5. Thus, statement A is correct. Statement B is incorrect because it is a tetraprotic acid (four ionizable H atoms). Statement C is incorrect because P is in its highest oxidation state (+5) and typically acts as an oxidizing agent, not a reducing agent. Statement D is also correct about the P-O-P bond, but only one correct answer is requested per the output format.
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