NEET 2012 Chemistry question

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

(1)All oxoacids contain at least one unit and one group
(2)Orthophosphoric acid is used in the manufacture of triple superphosphate.
(3)Hypophosphorous acid is a diprotic acid.Correct
(4)All oxoacids contain tetrahedral four coordinated phosphorous

Answer: (3)

Solution

Hypophosphorous acid, , has the structure : only one group, because the two H atoms attached directly to P are not ionisable. It is therefore a monoprotic (monobasic) acid, so statement (3) is not valid. Statement (1) is true (every oxoacid

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Question ID VK-091123