The true statement for the acids of phosphorus. `H_(3)PO_(2), H_(3)PO_(3) and H_(3)PO_(4)` is :

Options

A. the order of their acidity is `H_(3)PO_(4) lt H_(3)PO_(3) lt H_(3)PO_(2)`
B. all of them are reducing in nature
C. all of them are tribasic acids
D. the geometry of phosphor us is tetrahedral in all the three

Answer

D

Explanation

(i) The geometry of phosphorus is tetrahedral in all the three.

(ii) The acidity increases with increase in oxidation number of central atom
`H_(3)overset(+1)(PO_(2)) lt H_(3)overset(+3)(PO_(3)) lt H_(3)overset(+5)(PO_(4))`
(iii) `H_(3)PO_(4)` is not reducing.
(iv) `H_(3)PO_(3)` is diabasic, while `H_(3)PO_(2)` is monobasic.