Question detail
How does sacrificial protection work to prevent rusting of iron?
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. By forming a protective layer on the iron
- B. By allowing air to reach the iron
- C. By corroding the more reactive metal instead of the iron
- D. By increasing the strength of the iron
Answer
The correct option is By corroding the more reactive metal instead of the iron. This answer is correct because it matches the approved learning objective to explain sacrificial protection in terms of a more reactive metal corroding instead of iron. (Chemistry only) in the subtopic Corrosion and its prevention.
Explanation
The correct option is By corroding the more reactive metal instead of the iron. By corroding the more reactive metal instead of the iron is correct because it directly supports the approved learning objective to explain sacrificial protection in terms of a more reactive metal corroding instead of iron. (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 Sacrificial Protection
Students often confuse sacrificial protection with barrier protection, thinking that both involve covering iron to prevent corrosion.
Clarify that sacrificial protection involves using a more reactive metal that corrodes instead of iron, while barrier protection involves coating iron with materials like paint or grease.
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