Question detail
In the context of water treatment, what does the term 'disinfection' refer to?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Group 7(17), the halogens
Question
- A. Removing all solids from water
- B. Killing or inactivating harmful microorganisms
- C. Improving the taste and odor of water
- D. Adding minerals to enhance water quality
Answer
Killing or inactivating harmful microorganisms
Explanation
Disinfection in water treatment specifically refers to the process of killing or inactivating harmful microorganisms to ensure the water is safe for human consumption.
Common mistake
Misunderstanding Chlorine's Role
Students often confuse the role of chlorine in water treatment as solely a disinfectant, neglecting its role in oxidation and the formation of chlorinated compounds.
Chlorine acts as a strong oxidizing agent in water treatment. When chlorine is added to water, it reacts to form hypochlorous acid (HOCl), which kills bacteria and other pathogens. The reaction can be summarized as: Cl2 + H2O ⇌ HOCl + HCl. This shows that chlorine not only disinfects but also contributes to the formation of chlorinated by-products.
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