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

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.