Question detail
What two elements are necessary for iron to rust?
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. Air and water
- B. Oxygen and carbon dioxide
- C. Heat and moisture
- D. Salt and air
Answer
The correct option is Air and water. This answer is correct because it matches the approved learning objective to explain that both air and water are needed for iron to rust. (Chemistry only) in the subtopic Corrosion and its prevention.
Explanation
The correct option is Air and water. Air and water is correct because it directly supports the approved learning objective to explain that both air and water are needed for iron to rust. (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
Common Misunderstanding of Rusting
Students often think that only one of air or water is needed for iron to rust, believing that either can be sufficient on its own.
Emphasize that both air and water are essential for the rusting process to occur, as they work together to facilitate the chemical reactions that lead to corrosion.
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