This video lecture from The Halogens and The Noble Gases (F.Sc. second year Chemistry) covers: The details of Hasenclever and The Beckmann’s methods for the manufacturing of Bleaching powder and the advantage of one over the other. Practical uses of calcium hypochlorite. 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.