Question detail
Why does aluminium form an oxide coating?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Using materials
Question
- A. To enhance its conductivity
- B. To protect it from corrosion
- C. To improve its strength
- D. To increase its weight
Answer
The correct option is To protect it from corrosion. This answer is correct because it matches the approved learning objective to explain why aluminium resists further corrosion because of its oxide coating. (Chemistry only) in the subtopic Corrosion and its prevention.
Explanation
The correct option is To protect it from corrosion. To protect it from corrosion is correct because it directly supports the approved learning objective to explain why aluminium resists further corrosion because of its oxide coating. (Chemistry only). This belongs to the subtopic Corrosion and its prevention within Using materials, 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 Corrosion and its prevention.
Common mistake
Aluminium Corrosion Resistance
Students often think that aluminium does not corrode at all.
Explain that aluminium does corrode, but the oxide coating that forms protects it from further corrosion.
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