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  1. Which one of the following is extensively used for sterilizing water ?

  2. A.

     Bleaching powder

    B.

     Alum

    C.

     Borax powder

    D.

     Soda powder

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    Answer : Option A

    Explanation :

    Bleaching powder is extensively used in sterilizing water. Calcium hypochlorite is a chemical compound with formula Ca(OCl)2. It is widely used for water treatment and as a bleaching agent (bleaching powder). This chemical is considered to be relatively stable and has greater available chlorine than sodium hypochlorite (liquid bleach). Calcium hypochlorite is a yellow white solid which has a strong smell of chlorine. It is not highly soluble in water, and is more preferably used in soft to medium-hard water. It has two forms: a dry form and a hydrated form. The hydrated form is safer to handle.


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