Question detail
Which process uses a semi-permeable membrane to remove salts from 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. Distillation
- B. Reverse osmosis
- C. Filtration
- D. Evaporation
Answer
The correct option is Reverse osmosis. This answer is correct because it matches the approved learning objective to compare distillation and membrane processes such as reverse osmosis for desalination in the subtopic Potable water.
Explanation
The correct option is Reverse osmosis. Reverse osmosis is correct because it directly supports the approved learning objective to compare distillation and membrane processes such as reverse osmosis for desalination. This belongs to the subtopic Potable water within Using the Earth's resources and obtaining potable water, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Potable water.
Common mistake
Confusing Distillation and Reverse Osmosis
Students often confuse the processes of distillation and reverse osmosis, thinking they are the same method for desalination.
Do not treat this as a general statement about desalination. Instead, answer by clearly linking the correction to compare distillation and membrane processes such as reverse osmosis for desalination in Potable water. This keeps the response inside Using the Earth's resources and obtaining potable water and prevents a vague or off-topic GCSE answer. The mistake to avoid is: students often confuse the processes of distillation and reverse osmosis, thinking they are the same method for desalination.
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