Question detail
Which of the following experiments would best demonstrate that both air and water are necessary for rusting?
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. Iron in water only
- B. Iron in oil
- C. Iron in a sealed container with water
- D. Iron in a container with water and air exposure
Answer
The correct option is Iron in a container with water and air exposure. 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 Iron in a container with water and air exposure. Iron in a container with water and air exposure 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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