Consider the following oxoacids of phosphorus : $H_{3} P O_{4}$ , $H_{3} P O_{3}$ and $H_{3} P O_{2}$ All ' P ' atoms in the oxoacids and oxoanions are 4 coordinate 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:

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1, 0 and 2

2, 0 and 1

0, 1 and 2

2, 1 and O

answer is C.

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Detailed Solution

The acidic hydrogens present in one formula unit of ${NaH}_{2} {PO}_{4}$ is 2.

The acidic hydrogens present in one formula unit of ${NaH}_{2} {PO}_{3}$ is 1.

The acidic hydrogens present in one formula unit of ${NaH}_{2} {PO}_{2}$ is 0.

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