PH3: Phosphine H3N: ammonia H3PO2: Hypophosphorus Acid CuSO4: Copper Sulphate P2O2: Phosphorus Dioxide H2SO5:Peroxymonosulfuric acid Titanium(IV) Oxide: TiO2 Solution PH3: Phosphine H3N: ammonia H3PO2: Hypophosphorus Acid CuSO4: Copper Sulphate P2O2: Phosphorus Dioxide H2SO5:Peroxymonosulfuric acid Titanium(IV) Oxide: TiO2.