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KCET2023Chemistryp Block Elements (Group 15, 16, 17 & 18)

Which one of the following oxoacids of phosphorus can reduce AgNO ₃ to metallic silver?

Options

  1. AH ₃ PO ₂
  2. BH ₄ P ₂ O ₇
  3. CH ₄ P ₂ O ₆
  4. DH ₃ PO ₄

Correct answer

A. H ₃ PO ₂

Step-by-step solution

Hypophosphorus acid ( H ₃ PO ₂ ) is a strong reducing agent which can effectively reduce Ag ⁺ ions to Ag and itself gets oxidise to phosphorus acid [ H ₃ PO ₃ ] as follows aligned 3 AgNO ₃+4 H ₃ PO ₂+ H ₂ O & 3 Ag +4 H ₃ PO ₃ & +3 HNO ₃ aligned

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