For Electrolysis of aqueous solutions, which exam wording answer best supports this Unit 4.4 objective: Describe that aqueous solutions contain ions from the ionic compound and hydrogen ions and hydroxide ions from water?

The correct option is To allow free-moving ions to conduct electricity - correct exam wording for hydrogen.

The correct option is To allow free-moving ions to conduct electricity - correct exam wording for hydrogen. To allow free-moving ions to conduct electricity - correct exam wording for hydrogen is correct because it directly supports the approved learning objective to describe that aqueous solutions contain ions from the ionic compound and hydrogen ions and hydroxide ions from water. This exam wording variant asks students to separate hydrogen from similar Unit 4.4 chemical-change ideas. The reasoning belongs to Electrolysis of aqueous solutions 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 hydrogen 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.