For Using electrolysis to extract metals, which electrolysis focus answer best supports this Unit 4.4 objective: Describe aluminium ions gaining electrons at the cathode to form aluminium?

The correct option is They gain electrons to form aluminium. - correct electrolysis focus for cathode.

The correct option is They gain electrons to form aluminium. - correct electrolysis focus for cathode. They gain electrons to form aluminium. - correct electrolysis focus for cathode is correct because it directly supports the approved learning objective to describe aluminium ions gaining electrons at the cathode to form aluminium. This electrolysis focus variant asks students to separate cathode from similar Unit 4.4 chemical-change ideas. The reasoning belongs to Using electrolysis to extract metals within Electrolysis, so it should not be confused with nearby ideas about acids, alkalis, bases, oxidation, reduction, displacement, reactivity, electrolysis, electrodes, ions, pH, or salt preparation unless those are named in the objective. Use the focus term cathode to keep the answer aligned with AQA GCSE Chemistry 8462 Unit 4.4 Chemical changes. Keep acid, alkali and base distinct; keep oxidation and reduction distinct; do not mix reduction with displacement; keep electrolysis separate from electroplating; distinguish anode from cathode, positive ions from negative ions, oxidation state from ionic charge, and strong acid from concentrated acid. The other options are weaker because they either use the wrong reaction type, wrong ion, wrong electrode, wrong acid-base distinction, vague wording, or the wrong chemical-change context.