HPO2 is called Metaphosphoric acid.
Here's a breakdown:
According to the reference provided, HPO2 is listed as one of the oxoacids of phosphorus. Specifically, the reference mentions:
Oxoacids of Phosphorus are Hypophosphoric acid(H3PO4), Metaphosphoric acid(HPO2), Pyrophosphoric acid (H4P2O7), Hypophosphorous acid(H3PO2), Phosphorous acid (H3PO3), Peroxophosphoric acid (H3PO5), Orthophosphoric acid (H3PO5).
Therefore, the correct name for the chemical formula HPO2 is Metaphosphoric acid.
