A) Alcohol
B) carbon dioxide
C) chlorine
D) sodium chloride
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The correct answer is C) chlorine
The most commonly used bleaching agent is chlorine. Chlorine is a powerful oxidizer and is the active agent in many household bleaches. It is also used extensively for cellulosic, protein fibers such as wool and silk, and cotton cloth.
Additionally, sodium chlorite and sodium hypochlorite are alternative bleaching agents used to bleach cotton cloth. Wood and animal fibres are also bleached with hydrogen peroxide, which is the most common bleaching agent for these materials.
As pure chlorine is a toxic corrosive gas, these products are provided in liquid form for safer use.