This video lecture from Group VA and Group VIA Elements (F.Sc. second year Chemistry) covers the oxides of phosphorus including phosphorus trioxide and phosphorus pentaoxide. The structures, preparation, physical properties and chemical reactions of both compounds are discussed in detail. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.