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

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Phosphorus acid <Hypophosphoric acid < Orthophosphoric acid

Hypophosphoric acid < Pyrophosphoric acid < Orthophosphoric acid

Pyrophosphoric acid < Orthophosphoric acid < Hypophosphoric acid

Pyrophosphoric acid < Hypophosphoric acid < Orthophosphoric acid

answer is A.

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Detailed Solution

Oxidation state of P in Phosphorus Acid, H₃PO₃is +3.
Oxidation state of P in Phosphoric Acid, H₃PO₄is +5.
Oxidation state of P in Hypophosphoric Acid, H₄P₂O₆is +4.
Oxidation state of P in Pyrophosphoric Acid, H₄P₂O₇is +5.
Oxidation state of P in Orthophosphoric Acid (Phosphoric Acid), H₃PO₄is +5.
Oxidation state of P in metaphosphoric Acid, HPO₃is +5.

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