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Industrial electrolysis: aluminium extraction and chlor-alkali process
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40 AQA GCSE Chemistry questions on Industrial electrolysis: aluminium extraction and chlor-alkali process, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Industrial electrolysis: aluminium extraction and chlor-alkali process

Question 1 · 1 mark · Difficulty 1/3

Which half equation represents the formation of aluminium at the cathode?

  1. 2O²⁻ → O₂ + 4e⁻
  2. Al³⁺ → Al + 3e⁻
  3. Al³⁺ + 3e⁻ → Al
  4. Al → Al³⁺ + 3e⁻
Show answer & explanation
✓ Answer: C — Al³⁺ + 3e⁻ → Al
Award 1 mark. The aluminium ion gains three electrons, which balances its 3+ charge and is a reduction. Equations showing electrons being lost describe the anode instead.
Question 2 · 1 mark · Difficulty 1/3

Why can aluminium not be extracted by heating its ore with carbon?

  1. Aluminium melts before the reaction can start
  2. Aluminium is more reactive than carbon, so carbon cannot displace it
  3. Aluminium oxide is too cheap to be worth reducing
  4. Carbon is not available in sufficient quantity
Show answer & explanation
✓ Answer: B — Aluminium is more reactive than carbon, so carbon cannot displace it
Award 1 mark. Only metals less reactive than carbon, such as iron, can be extracted that way. Electrolysis is therefore required, and it is what makes aluminium expensive to produce.
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AQA GCSE Chemistry: Industrial electrolysis: aluminium extraction and chlor-alkali process FAQ

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How is Industrial electrolysis: aluminium extraction and chlor-alkali process typically tested on AQA GCSE Chemistry papers?
Industrial electrolysis: aluminium extraction and chlor-alkali process appears across multiple question types on real AQA GCSE Chemistry papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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