Question detail

For The proportions of different gases in the atmosphere, which option best answers the exam wording in this AQA GCSE Chemistry objective: Recall that the Earth's atmosphere is about 80 percent nitrogen?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

The composition and evolution of the Earth's atmosphere

Question

A. Nitrogen
B. Oxygen
C. Carbon Dioxide
D. Methane

Answer

The correct option is Methane. This option is correct because it directly matches the exam wording required by the learning objective in The proportions of different gases in the atmosphere.

Explanation

Methane is the correct option. It supports the approved learning objective: Recall that the Earth's atmosphere is about 80 percent nitrogen. 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

Nitrogen Proportion Confusion

Students often confuse the proportion of nitrogen in the Earth's atmosphere with that of oxygen, thinking it is around 20 percent instead of 80 percent.

To fix this, students should remember that nitrogen makes up the majority of the atmosphere at about 80 percent, while oxygen is around 20 percent.

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