Question detail

For Electrolysis of aqueous solutions, which redox focus answer best supports this Unit 4.4 objective: Predict that the metal is produced at the cathode if it is less reactive than hydrogen?

Try the question, check the answer, then read the explanation to understand the curriculum point.

At a glance

MCQ

Type

practice

Style

Topic

Electrolysis

Question

  1. A. They move to the anode. - correct redox focus for hydrogen
  2. B. Wrong redox focus: confuses hydrogen with a nearby Unit 4.4 chemical change idea
  3. C. Wrong particle check: uses the wrong ion, electrode, acid-base term, or product for Electrolysis of aqueous solutions
  4. D. Wrong reaction link: does not support Predict that the metal is produced at the cathode if it is less reactive than hydrogen

Answer

The correct option is They move to the anode. - correct redox focus for hydrogen.

Explanation

The correct option is They move to the anode. - correct redox focus for hydrogen. They move to the anode. - correct redox focus for hydrogen is correct because it directly supports the approved learning objective to predict that the metal is produced at the cathode if it is less reactive than hydrogen. This redox focus 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.

Common mistake

Misunderstanding Reactivity

Students often think that the metal will always be produced at the cathode during electrolysis, regardless of its reactivity compared to hydrogen.

Remind students that a metal will only be produced at the cathode if it is less reactive than hydrogen; otherwise, hydrogen gas will be produced instead.

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