Question detail
How does galvanizing protect 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 applying a layer of paint
- B. By using a less reactive metal
- C. By using a more reactive metal that corrodes first
- D. By removing iron from the environment
Answer
The correct option is By using a more reactive metal that corrodes first. This answer is correct because it matches the approved learning objective to distinguish barrier protection from sacrificial protection. (Chemistry only) in the subtopic Corrosion and its prevention.
Explanation
The correct option is By using a more reactive metal that corrodes first. By using a more reactive metal that corrodes first is correct because it directly supports the approved learning objective to distinguish barrier protection from sacrificial protection. (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
Confusing Protection Methods
Students often confuse barrier protection with sacrificial protection, thinking they are the same.
Remember that barrier protection involves covering the metal with a protective layer (like paint or grease), while sacrificial protection involves using a more reactive metal that corrodes instead of the iron.
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