Question detail
For Using electrolysis to extract metals, which reaction focus answer best supports this Unit 4.4 objective: Explain why aluminium is extracted by electrolysis rather than 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
Electrolysis
Question
- A. They gain electrons to form aluminium - correct reaction focus for electrolysis
- B. Wrong reaction focus: confuses electrolysis with a nearby Unit 4.4 chemical change idea
- C. Wrong particle check: uses the wrong ion, electrode, acid-base term, or product for Using electrolysis to extract metals
- D. Wrong reaction link: does not support Explain why aluminium is extracted by electrolysis rather than reduction with carbon
Answer
The correct option is They gain electrons to form aluminium - correct reaction focus for electrolysis.
Explanation
The correct option is "They gain electrons to form aluminium - correct reaction focus for electrolysis" because it supports the approved learning objective: Explain why aluminium is extracted by electrolysis rather than reduction with carbon. The other options are incorrect or weaker because they are vague, use the wrong Chemistry context, or do not clearly explain the answer for Using electrolysis to extract metals.
Common mistake
Aluminium extraction via carbon reduction
Students think aluminium can be extracted by reducing Al₂O₃ with carbon because aluminium is a metal.
Aluminium oxide is too stable for reduction with carbon; the high temperature required would also melt the carbon anode, so electrolysis is used instead.
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