Question detail
Which statement best describes sacrificial protection?
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 involves coating iron with a layer of paint.
- B. It uses a more reactive metal to protect iron from corrosion.
- C. It requires both air and water to be effective.
- D. It is a method of galvanizing iron.
Answer
The correct option is It uses a more reactive metal to protect iron from corrosion.. 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 It uses a more reactive metal to protect iron from corrosion.. It uses a more reactive metal to protect iron from corrosion. 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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