Home PYQs UPPSC UPPSC MCQs Prelims 2013 (GS Paper I)

Question

Which one of the following gases is used for the purification of drinking water?

  1. Sulphur dioxide
  2. Chlorine
  3. Fluorine
  4. Carbon dioxide

Answer:

Option B: Chlorine

Detailed Solution:

The correct answer is “Chlorine”.

Chlorine is a strong oxidizing disinfectant that has been used for more than 60 years to treat drinking water supplies. The gas is passed through water to kill bacteria.