This video lecture from Group VA and Group VIA Elements (F.Sc. second year Chemistry) covers the structure and preparation of nitrogen dioxide. Its structure has a resonating single and double bond between nitrogen and oxygen atoms respectively. It can be prepared by the decomposition of lead nitrate at high temperature or by the action of concentrated nitric acid on copper. 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.