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WBCS Main Examination 2023 — Paper IV: General Studies II · Question 45 of 200

Q45
General ScienceChemistry
Water is disinfected with
  1. a.KMnO$_4$
  2. b.Cl$_2$
  3. c.Both
  4. d.NO$_2$

Answer: (C) Both

Chlorine is the standard disinfectant for public water supplies, and potassium permanganate is widely used to disinfect well water in rural areas. Since both are used, (C) is correct; NO$_2$ is a pollutant, not a disinfectant.

Q44 Whole paperQ46