For Metal oxides, which ion focus answer best supports this Unit 4.4 objective: Link metal oxide reactions with acids to neutralisation and salt formation?

The correct option is They produce water and salt. - correct ion focus for metal oxide.

The correct option is They produce water and salt. - correct ion focus for metal oxide. They produce water and salt. - correct ion focus for metal oxide is correct because it directly supports the approved learning objective to link metal oxide reactions with acids to neutralisation and salt formation. This ion focus variant asks students to separate metal oxide from similar Unit 4.4 chemical-change ideas. The reasoning belongs to Metal oxides within Reactivity of metals, 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 metal oxide 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.