Question detail
Which of the following is a consequence of chlorine's use in water treatment?
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. It can lead to the formation of harmful chlorinated by-products.
- B. It increases the hardness of the water.
- C. It reduces the pH of the water significantly.
- D. It enhances the taste of the water.
Answer
It can lead to the formation of harmful chlorinated by-products.
Explanation
While chlorine is effective in killing pathogens in water treatment, its reaction with organic materials can lead to the formation of harmful chlorinated by-products, which pose health risks. This highlights the need for careful management of chlorine use.
Common mistake
Misunderstanding Disproportionation
Students often confuse disproportionation reactions with simple redox reactions, failing to recognize that in disproportionation, the same element is both oxidized and reduced.
To clarify, remember that in a disproportionation reaction, such as chlorine reacting with water, chlorine is oxidized to form chloride ions and reduced to form hypochlorous acid. Write the half-equations to show the oxidation and reduction processes clearly.
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