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Q.

The correct arrangement of following acids of phosphorus in the increasing order of oxidation state of phosphorous is

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a

Phosphorus acid <Hypophosphoric acid < Orthophosphoric acid

b

Hypophosphoric acid < Pyrophosphoric acid < Orthophosphoric acid

c

Pyrophosphoric acid < Orthophosphoric acid < Hypophosphoric acid

d

Pyrophosphoric acid < Hypophosphoric acid < Orthophosphoric acid

answer is A.

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Detailed Solution

  • Oxidation state of P in Phosphorus Acid, H3PO3 is +3.
  • Oxidation state of P in Phosphoric Acid, H3PO4 is +5.
  • Oxidation state of P in Hypophosphoric Acid, H4P2O6 is +4.
  • Oxidation state of P in Pyrophosphoric Acid, H4P2O7 is +5.
  • Oxidation state of P in Orthophosphoric Acid (Phosphoric Acid), H3PO4 is +5.
  • Oxidation state of P in metaphosphoric Acid, HPO3 is +5.
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