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Q.

Best reducing agent among the following is

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a

H3PO3

b

H3PO4

c

H3PO2

d

H3PO5

answer is C.

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Detailed Solution

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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 ;

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H3PO3 contains one P-H bond….It is also a reducing agent ;

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Reducing power of  H3PO2> H3PO3

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