Which of the Phosphorus oxoacid can create silver mirror from solution?

Question

Which of the Phosphorus oxoacid can create silver mirror from  solution?

Canvas Classes · Accepted Answer

The silver mirror test (reduction of  to Ag) requires a reducing agent. Phosphorus oxoacids with P–H bonds are reducing agents.

Checking P–H bonds:

| Acid | P–H bonds | Reducing? |
|---|---|---|
|  (metaphosphoric) | 0 | No |
|  (pyrophosphorous) | 2 (one per P) | Yes ✓ |
|  (hypophosphoric) | 0 | No |
|  (pyrophosphoric) | 0 | No |

has P–H bonds and can reduce  to give silver mirror.

Answer: Option (2) —

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