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Phosphorous forms many oxo acids. The best reducing agent among the following oxo acids is

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

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

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

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

answer is C.

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Detailed Solution

P-H bonds are responsible for reducing power;

$H_{3} {PO}_{4}$ and $H_{4} P_{2} O_{7}$ have no P-H bonds.

More the Number of P-H bonds, greater is the reducing power.

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