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Every question is written against the published AQA GCSE Chemistry syllabus and reviewed for accuracy before being added to the bank. We match the command words (state, describe, explain, evaluate), mark allocations, and difficulty tier you'll see on real AQA past papers. Explanations are written in the style of official examiner mark schemes so students learn exactly what marks are being awarded for.

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AQA · GCSE · Chemistry

One real Chemistry question.
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Topic: Chemistry of the atmosphere: evolution and composition of the Earth's atmosphere. Pick an answer — get the mark scheme instantly.

Question · Difficulty 2/3

Oxygen levels rose in the atmosphere mainly because of:

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One real Chemistry question.No signup. 30 seconds.

One real Chemistry question.
No signup. 30 seconds.