This video lecture from The Halogens and The Noble Gases (F.Sc. second year Chemistry) covers: Concept of decolorizing(Bleaching) and how it works by breaking the bonds in chromophores by oxidation or reduction. Chemical properties of calcium hypochlorite (the bleaching powder). 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.