This video lecture from Group VA and Group VIA Elements (F.Sc. second year Chemistry) covers the structure and preparation of di-nitrogen oxide commonly known as nitrous oxide or nitro. Nitrous oxide can be prepared by the oxidation of zinc metal by dilute nitric acid or by the decomposition of ammonium nitrate at high temperature. Both methods involve the reduction of nitrate group and the change in oxidation state of nitrogen from +5 to +1. 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.