Question detail

What was the primary gas in the Earth's early atmosphere?

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. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Hydrogen

Answer

The correct option is Carbon dioxide. This answer is correct because it matches the approved learning objective to describe the Earth's early atmosphere as probably containing mainly carbon dioxide with little or no oxygen in the subtopic The Earth's early atmosphere.

Explanation

The correct option is Carbon dioxide. Carbon dioxide is correct because it directly supports the approved learning objective to describe the Earth's early atmosphere as probably containing mainly carbon dioxide with little or no oxygen. This belongs to the subtopic The Earth's early 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 Earth's early atmosphere.

Common mistake

Misunderstanding Early Atmosphere Composition

Students often state that the Earth's early atmosphere contained mainly oxygen instead of carbon dioxide.

Remember that the Earth's early atmosphere is described as probably containing mainly carbon dioxide with little or no oxygen.

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For The Earth's early atmosphere in The composition and evolution of the Earth's atmosphere, which option best answers the process focus in this AQA GCSE Chemistry point: Describe the Earth's early atmosphere as probably containing mainly carbon dioxide with little or no oxygen?