This video lecture from Group VA and Group VIA Elements (F.Sc. second year Chemistry) covers the oxidation reactions of nitrogen dioxide or nitrogen peroxide. Nitrogen dioxide serves as a strong oxidizing agent and oxidizes hydrogen sulfide gas to sulfur, ferrous sulfate to ferric sulfate and potassium iodide into solid iodine. 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.