Question

What is meant by bleaching?explain.

Answer 1

Bleach is the name given to a group of chemicals, which are used industrially and domestically to whiten clothes, lighten hair color and remove stains. Many bleaches have broad spectrum bactericidal properties, making them useful for disinfecting and sterilizing and are used in swimming pool sanitation to control bacteria, viruses, and algae and in many places where sterile conditions are required. They are also used in many industrial processes, notably in the bleaching of wood pulp. Bleach is also used for removing mildew, killing weeds, and increasing the longevity of cut flowers.[1]

The bleaching process has been known for millennia,[2] but the chemicals currently used for bleaching resulted from the work of several 18th century scientists. Chlorine is the basis for the most common bleaches: for example, the solution of sodium hypochlorite, which is so ubiquitous that most simply call it "bleach", and calcium hypochlorite, the active compound in "bleaching powder". Oxidizing bleaching agents that do not contain chlorine are usually based on peroxides such as hydrogen peroxide, sodium percarbonate, and sodium perborate. While most bleaches are oxidizing agents, some are reducing agentssuch as sodium dithionite and sodium borohydride.

Answer 2

bleaching means to discolour coloured object.... bleaching is use in paper industry to bleach wood pulp