Biology
Grade-7
Easy

Question

Choose the chemical that is used to disinfect water. (understand)

  1. Chlorine
  2. Washing soda
  3. Silica
  4. Coal

hintHint:

It forms negative ions in water.

The correct answer is: Chlorine


    • Chlorine is used to disinfect water
    • Disinfection refers to removal of bacteria with chemical agents
    • Chlorine is a cost effective method for water purification
    • Chlorine breaks bonds present in microbes, thereby killing the organisms
    • Chlorine is used in the form of chlorine gas, sodium hypochlorite and calcium hypochlorite for water purification

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