P4 is white phosphorus. Since white phosphorus can be easily oxidized, it acts as a strong reducing agent. Concentrated HNO3 (nitric acid) oxidizes P4 to H3PO4 (orthophosphoric acid)
P4 + 20HNO3 → 20NO2 + 4H3PO4 + 4H2O
Hence, H3PO4 is obtained.
Since, white phosphorus is a strong reducing agent. Hence, it reduces HNO3 to NO2
Note: the Reducing agent is an element which loses(donates) electrons.
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