Consider the following oxoacids of phosphorus : `H_(3)PO_(4),H_(3)PO_(3) and H_(3)PO_(2)`. All 'P' atoms in the oxoaxids and oxoanions are 4 corrdinate and contain at least one P = O unit. All 'P' atoms in oxoacids have at least one `P-OH` group which ionises to give `H^(+)` ion. The oxidation state of 'P' is `+5` only when it is directly attached to 4 oxygen atoms. For every two units decrease in oxidation state of Phosphorus, there is one `P-H` bond.
The number of acidic hydrogens present in one formula unit of each of `NaH_(2)PO_(4), NaH_(2)PO_(3)` and `NaH_(2)PO_(2)` are respectively:

Options

A. 0, 1 and 2
B. 1, 0 and 2
C. 2, 1 and 0
D. 2, 0 and 1

Answer

C