Question detail
What is the primary cause of rusting in 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. Chemical reaction with oxygen and water
- B. Physical damage to the metal
- C. Exposure to high temperatures
- D. Presence of salt only
Answer
The correct option is Chemical reaction with oxygen and water. 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 Chemical reaction with oxygen and water. Chemical reaction with oxygen and water 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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