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Which of the following statements is not...

Which of the following statements is not valid for oxoacids of phosphorus?

A

Orthophosphoric acid is used in the manufacture of triple superphosphate.

B

Hypophosphorous acid is a diprotic acid.

C

All oxoacids contain tetrahedral four coordinated Phosphorus.

D

All oxoacids contain at least one P = O unit and one P-OH group.

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