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    Biology
    Grade-7
    Easy

    Question

    Choose the odd one out. (Analyze)

    1. Filteration
    2. Distillation
    3. Sedimentation
    4. Chlorination

    hintHint:

    The process which involves usage of a chemical.

    The correct answer is: Chlorination

      • Distillation, sedimentation and filtration are all physical methods of separation
      • These methods are not based on the use of any chemical agent 
      • Chlorination is a chemical method of purification of water
      • Chlorine is added to water to kill the microbes in it
      • The chlorine breaks the bonds in the microbes thereby damaging the cell wall and killing the organism

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