MCQ
Which of the Phosphorus oxoacid can create silver mirror from $AgNO _3$ solution ?
- A$\left( HPO _3\right)_{ n }$
- ✓$H _4 P _2 O _5$
- C$H _4 P _2 O _6$
- D$H _4 P _2 O _7$

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| Reaction | Product | |
| $I$ | $RX + AgCN$ | $RNC$ |
| $II$ | $RX + KCN$ | $RCN$ |
| $III$ | $RX + KNO_2$ | (image) |
| $IV$ | $RX + AgNO_2$ | $R-O-N = O$ |
