Question detail
Which gas is present in the Earth's atmosphere in the smallest proportion?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
The composition and evolution of the Earth's atmosphere
Question
- A. Oxygen
- B. Carbon dioxide
- C. Nitrogen
- D. Argon
Answer
The correct option is Carbon dioxide. This answer is correct because it matches the approved learning objective to explain why percentage composition is useful when describing atmospheric gases in the subtopic The proportions of different gases in the atmosphere.
Explanation
The correct option is Carbon dioxide. Carbon dioxide is correct because it directly supports the approved learning objective to explain why percentage composition is useful when describing atmospheric gases. This belongs to the subtopic The proportions of different gases in the atmosphere within The composition and evolution of the Earth's atmosphere, 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 The proportions of different gases in the atmosphere.
Common mistake
Misunderstanding Percentage Composition
Students often confuse percentage composition with absolute amounts of gases, thinking it refers to the total volume rather than the proportion of each gas in the atmosphere.
Emphasize that percentage composition describes the relative proportions of each gas in the atmosphere, helping to understand the significance of each gas's presence.
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