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JEE Main2016Chemistryp Block Elements (Group 15, 16, 17 & 18)Actual

The pair in which phosphorous atoms have a formal oxidation state of + 3 is:

Options

  1. AOrthophosphorous and hypophospheric acids
  2. BPyrophosphorous and pyrophosphoric acids
  3. COrthophosphorous and pyrophosphorous acids
  4. DPyrophosphorous and hypophosphoric acids

Correct answer

C. Orthophosphorous and pyrophosphorous acids

Step-by-step solution

Acid Formula Formal oxidation state of phosphorous Pyrophosphorous acid H 4 P 2 O 5 + 3 Pyrophosphoric acid H 4 P 2 O 7 + 5 Orthophosphorous H 3 P O 3 + 3 Hypophosphoric acid H 4 P 2 O 6 + 4 Both pyrophosphorous and orthophosphorous acid have + 3 formal oxidation state

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