Question detail
What is the main reason that aluminum resists further corrosion after its initial exposure?
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. It forms a thick layer of rust.
- B. It develops a protective oxide coating.
- C. It is a noble metal.
- D. It is always kept in a dry environment.
Answer
The correct option is It develops a protective oxide coating.. This answer is correct because it matches the approved learning objective to explain how barrier coatings such as grease, paint and electroplating prevent corrosion. (Chemistry only) in the subtopic Corrosion and its prevention.
Explanation
The correct option is It develops a protective oxide coating.. It develops a protective oxide coating. is correct because it directly supports the approved learning objective to explain how barrier coatings such as grease, paint and electroplating prevent corrosion. (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
Misunderstanding Barrier Coatings
Students often think that barrier coatings completely stop corrosion rather than just slowing it down.
Emphasize that barrier coatings like grease, paint, and electroplating create a protective layer that reduces exposure to air and water, thus slowing down the corrosion process.
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