Question detail
Which answer best matches the AQA GCSE Chemistry Potable water objective: recall chlorine, ozone and ultraviolet light as sterilising methods for potable water?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Using the Earth's resources and obtaining potable water
Question
- A. Chlorine
- B. Ozone
- C. Ultraviolet light
- D. Filtration
Answer
The correct option is Filtration. It matches Potable water because it directly supports: Recall chlorine, ozone and ultraviolet light as sterilising methods for potable water.
Explanation
The correct option is Filtration. It is correct because it tests recall chlorine, ozone and ultraviolet light as sterilising methods for potable water within Using the Earth's resources and obtaining potable water. Keep the Using resources concept boundary clear: do not swap finite resources with renewable resources, potable water with pure water, reuse with recycling, alloys with pure metals, polymers with composites, corrosion with oxidation, or fertilisers with nutrients unless the question asks for that comparison. Other options are weaker if they answer a neighbouring resource or sustainability idea instead of this exact objective.
Common mistake
Confusing Sterilisation Methods
Students often confuse the sterilising methods for potable water, thinking that chlorine and ozone serve the same purpose as ultraviolet light.
Remember that chlorine and ozone are chemical methods that disinfect water, while ultraviolet light is a physical method that kills microbes without adding chemicals.
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