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[" Which of the following statements is ...

[" 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."],[" (b) All oxoacids contain tetrahedral four "],[" coordinated phosphorus."],[" (d) All oxoacids contain atleast one "P=0],[" unit and one "P-OH" group."]]

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