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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: Chemical changes: half equations and electrode reactions in electrolysis. Pick an answer — get the mark scheme instantly.

Question · Difficulty 2/3

Molten lithium oxide is electrolysed. How many electrons appear in the balanced anode half equation that forms oxygen?

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One real Chemistry question.No signup. 30 seconds.

One real Chemistry question.
No signup. 30 seconds.