The d-And-f-Block Elements

The d-And-f-Block Elements

Question

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

  • Pyrophosphorous and hypophosphoric acids

  • Orthophosphorous and hypophosphoric acids

  • Pyrophosphorous and pyrophosphoric acids

  • Orthophosphorous and pyrophosphorous acids

Answer

D.

Orthophosphorous and pyrophosphorous acids

Orthophosphorous H3PO4

H3PxO3 = 3 +x + 3(-2) = 0 x = +3

pyrophosphorous acids H4P2O6


H4P2xO5 = 4 + 2x + 5 (-2) = 0
4 + 2x -10 = 0
x = +3

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