GATE CE 2023 Set 2 — Question 29
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Environmental Engineering → Drinking Water Treatment → Disinfection
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Question
Which of the following is/are NOT active disinfectant(s) in water treatment?
Correct answer
(D) Cl^- (chloride ion)
Solution
Active disinfectants are chemicals that effectively kill or inactivate pathogenic microorganisms.
- (Hydroxyl radical), (Ozone), and (Hypochlorite ion) are all strong oxidants used for disinfection in water treatment.
- (Chloride ion) is the stable, non-reactive form of chlorine and does not possess any disinfecting properties.
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