Q.

Which of the following is a reducing acid containing one P-H bond ?

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a

H3PO3

b

H3PO4

c

H3PO2

d

H3PO5

answer is A.

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Detailed Solution

Presence of P-H bonds is responsible for reducing property;More the number of P-H bonds/phosphorous atom , greater will be the reducing power ;Hypo phosphorous acid (or) Phosphinic acid ;H3PO3 contains one P-H bond….It is a reducing agent ;Reducing power of  H3PO2> H3PO3
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