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Which one of the following gases is used for the purification of drinking water?
1. Sulphur dioxide
2. Chlorine
3. Fluorine 
4. Carbon dioxide

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Correct Answer - Option 2 : Chlorine

The correct answer is Chlorine.

  • Chlorine gas is used in the purification of drinking water.
  • Chlorine
    • Chlorine (Cl), chemical element, the second lightest member of the halogen family elements, or Group 17 (Group VIIa) of the periodic table.
    • Chlorine is a toxic, corrosive, greenish-yellow gas that is jittery to the eyes and to the respiratory system.
    • Apart from very small amounts of free chlorine (Cl) in volcanic gases.
    • Chlorine is generally found only in the form of chemical compounds.
    • It accumulates 0.017 percent of Earth’s crust.
    • Natural chlorine is a mixture of two stationary isotopes: chlorine-35 (75.53 percent) and chlorine-37 (24.47 percent).
    • The most general compound of chlorine is sodium chloride, which is found in nature as crystalline rock salt, often discolored by impurities.
    • Sodium chloride is also found in seawater, which has an average concentration of about 2 percent of that salt.

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