Question detail
How does extracting copper from low-grade ores differ from reduction with carbon?
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. Low-grade extraction is more efficient.
- B. Reduction with carbon is used for high-grade ores.
- C. Low-grade extraction requires less energy.
- D. Reduction with carbon produces more waste.
Answer
The correct option is Reduction with carbon is used for high-grade ores.. This answer is correct because it matches the approved learning objective to distinguish extracting copper from low-grade ores from extracting metals by reduction with carbon in the subtopic Alternative methods of extracting metals.
Explanation
The correct option is Reduction with carbon is used for high-grade ores.. Reduction with carbon is used for high-grade ores. is correct because it directly supports the approved learning objective to distinguish extracting copper from low-grade ores from extracting metals by reduction with carbon. This belongs to the subtopic Alternative methods of extracting metals 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 Alternative methods of extracting metals.
Common mistake
Confusing Extraction Methods
Students often confuse the extraction of copper from low-grade ores with the reduction of metals using carbon.
Do not treat this as a general statement about low-grade ore. Instead, answer by clearly linking the correction to distinguish extracting copper from low-grade ores from extracting metals by reduction with carbon in Alternative methods of extracting metals. 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 extraction of copper from low-grade ores with the reduction of metals using carbon.
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