Biology
Grade-7
Easy

Question

Chemicals such as chlorine tablets or _______________can be added to the water of wells and water tanks to destroy harmful microbes and germs.

  1. Distillation
  2. Potassium permanganate
  3. Sewage
  4. Sewage

hintHint:

A chemical compound that is used in titration experiments in labs.

The correct answer is: Potassium permanganate


    • Water is essential for life on earth
    • Water is important for metabolism in living organisms and also for domestic and industrial purposes
    • Water needs to be purified to remove any debris or microbes present in it
    • The method of purification depends on the nature of water and the purpose for which water will be used later
    • Chemical method involves usage of chlorine or potassium permanganate for water purification
    • Potassium permanganate oxidizes elements like iron or manganese and removes them. It also destroys iron bacteria through the same method.

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