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JEE Main 2023 · 24 Jan · Shift 1 · Paper-1(B.E./B. Tech.)

JEE Main 2023 Chemistry question on p-Block Elements

Which of the Phosphorus oxoacid can create silver mirror from AgNO3\text{AgNO}_3 solution?
  1. A.
    H4P2O5\text{H}_4\text{P}_2\text{O}_5
  2. B.
    H4P2O7\text{H}_4\text{P}_2\text{O}_7
  3. C.
    (HPO3)n(\text{HPO}_3)_\text{n}
  4. D.
    H4P2O6\text{H}_4\text{P}_2\text{O}_6
Show answer and solution

Correct option: A

Solution

H₄P₂O₅ is pyrophosphorous acid, which contains P–H bonds (each phosphorus has one direct P–H bond, giving it reducing character). Phosphorus oxoacids with P–H bonds act as reducing agents and can reduce Ag⁺ from AgNO₃ solution to metallic silver, creating a silver mirror. H₄P₂O₇ (pyrophosphoric acid) and (HPO₃)ₙ (metaphosphoric acid) have no P–H bonds and are non-reducing, while H₄P₂O₆ (hypodiphosphoric acid) also lacks P–H bonds and cannot reduce AgNO₃.

[JEE Main 2023 · 24 Jan · Shift 1 · Paper-1(B.E./B. Tech.)]

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