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JEE Main levelSingle correct optionDifficulty 2 of 3pn094

Which one of the following aqueous acids will NOT reduce silver nitrate solution to metallic silver?

A $H X_{3} PO X_{2}$
B $H X_{3} PO X_{3}$
Ca mixture of $H X_{3} PO X_{2}$ and $H X_{3} PO X_{3}$
D $H X_{3} PO X_{4}$

Answer: D

Reducing behaviour of

H X_{3} PO X_{3}

and

H X_{3} PO X_{2}

comes from P-H bonds (P in a lower oxidation state, +3 and +1).

H X_{3} PO X_{4}

has P in +5 and no P-H bond, so it cannot reduce

Ag X^{+}

.

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