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Which of the following is correct statement?

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Hypophosphorus acid H₃PO₂ is also named as phosphonic acid.

Orthophosphorus acid H₂PO₃ is also named as phosphonic acid

Metaphosphoric acid exists as discrete molecules HPO₃

Orthrorphosphoric acid, metaphosphoric acid and pyrophosphoric acid all have
phosphorus in +5 oxidation state

answer is D.

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Detailed Solution

Hypoposphorus acid H3PO2 is also named as phosphinic acid.

Orthophosphorus acid H3PO3 is also known as phosphonic acid.

Metaphosphoric acid exists are cyclic trimer and linear polymer mainly.

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