We know that bleaching powder is used to bleach cotton fabrics.
How is bleaching powder prepared?
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Bleaching powder is prepared by passing chlorine gas (Cl2) over slaked lime (Ca(OH)2). Ca(OH)2+Cl2→Ca(OCl)2+H2O. The industrial preparation of bleaching powder is done through Hansenclever method. Hasenclever plant consists of a number of hollow horizontal cylinders of iron, generally four in number.
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