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Which of the following oxoacids of phosphorus has strongest reducing property?

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$H_{3} {PO}_{2}$

$H_{4} P_{2} O_{7}$

$H_{3} {PO}_{4}$

$H_{3} {PO}_{3}$

answer is D.

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Detailed Solution

Hypophosphorous acid is a good reducing agent as it contains two P–H bonds.

$4 {AgNO}_{3} + 2 H_{2} O + H_{3} {PO}_{2} \to_{}^{} 4 Ag + 4 {HNO}_{3} + H_{3} {PO}_{4}$

Reducing property $\propto$ number of P-H bonds

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