Question detail
What is the main purpose of using barrier coatings like paint on 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. To enhance the color of the iron
- B. To prevent moisture and air from reaching the iron
- C. To increase the weight of the iron
- D. To improve electrical conductivity
Answer
The correct option is To prevent moisture and air from reaching the iron. This answer is correct because it matches the approved learning objective to interpret results from rusting experiments. (Chemistry only) in the subtopic Corrosion and its prevention.
Explanation
The correct option is To prevent moisture and air from reaching the iron. To prevent moisture and air from reaching the iron is correct because it directly supports the approved learning objective to interpret results from rusting experiments. (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
Misinterpreting Rusting Results
Students often confuse the presence of rust with the absence of rusting conditions, failing to recognize that rusting requires both air and water.
To fix this, students should remember that rusting occurs only when both air and water are present, and they should analyze experimental results to identify these conditions.
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