Question detail
For The proportions of different gases in the atmosphere, which option best answers the effect evidence in this AQA GCSE Chemistry objective: Distinguish the major gases in the present atmosphere from trace atmospheric gases?
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. Methane
Answer
The correct option is Oxygen. This option is correct because it directly matches the effect evidence required by the learning objective in The proportions of different gases in the atmosphere.
Explanation
Oxygen is the correct option. It supports the approved learning objective: Distinguish the major gases in the present atmosphere from trace atmospheric gases. This answer belongs to The proportions of different gases in the atmosphere within The composition and evolution of the Earth's atmosphere, so it should not be confused with neighbouring atmospheric chemistry ideas. The other options are weaker if they describe a different atmospheric process, pollutant source, greenhouse gas effect, or climate interpretation.
Common mistake
Confusing Major and Trace Gases
Students often confuse major gases like nitrogen and oxygen with trace gases such as carbon dioxide and noble gases.
To fix this, students should memorize the major gases in the atmosphere and understand that trace gases are present in much smaller amounts.
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