Which of the Phosphorus oxoacid can create silver mirror from $AgNO _3$ solution?
- $H _4 P _2 O _7$
- $\left( HPO _3\right)_n$
- $H _4 P _2 O _6$
- $H _4 P _2 O _5$
The Correct Option is D
Solution and Explanation
Phosphorus oxoacids with a \( \text{P-H} \) bond act as reducing agents and can reduce \( \text{AgNO}_3 \) to silver (\( \text{Ag} \)), producing a silver mirror.
Among the given options, \( \text{H}_4\text{P}_2\text{O}_5 \) contains a \( \text{P-H} \) bond, which makes it capable of reducing \( \text{AgNO}_3 \).
The reaction mechanism involves the oxidation of the oxoacid, with the \( \text{P-H} \) bond breaking and silver (\( \text{Ag} \)) being reduced.
The silver forms a mirror on the surface of the reaction vessel.
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