Exercise 1 — IGCSE 0654 Nov 2025 Paper 31 Q7
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Cambridge IGCSE·Co-ordinated Sciences 0654·Chemistry
Electrolysis
Key knowledge — Electrochemistry
Key facts & rules
- Electrolysis: uses electrical energy to decompose an ionic compound (in solution or molten).
- Electrolyte: ionic compound that conducts electricity when dissolved or molten.
- Cathode (−): positive ions (cations) are attracted here and GAIN electrons (reduction).
- Anode (+): negative ions (anions) are attracted here and LOSE electrons (oxidation).
- Electrolysis of brine (NaCl solution): cathode → hydrogen gas; anode → chlorine gas; NaOH remains.
- Electrolysis of dilute H₂SO₄: cathode → hydrogen gas; anode → oxygen gas.
- Electroplating: object to be plated = cathode; plating metal = anode; solution of plating metal ions = electrolyte.
- Extraction of aluminium: Al₂O₃ dissolved in molten cryolite; cathode → Al; anode → O₂.
IGCSE Chemistry — Electrolysis
74 Cambridge IGCSE 0654 questions on electrolysis, across all three components.
About electrolysis on IGCSE 0654
Every Cambridge IGCSE Co-ordinated Sciences 0654 question on electrolysis (Electrochemistry, Chemistry), across all three exam components. Theory and alternative-to-practical come with full mark schemes; multiple choice is interactive — click an option to check it.
Theory
Electrolysis — Core theory questions13 total · Paper 3
Exercise 2 — IGCSE 0654 Mar 2025 Paper 32 Q8
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Exercise 3 — IGCSE 0654 Jun 2024 Paper 32 Q8
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Electrolysis — Extended theory questions13 total · Paper 4
Exercise 4 — IGCSE 0654 Nov 2025 Paper 42 Q6
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Exercise 5 — IGCSE 0654 Jun 2025 Paper 42 Q7
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Exercise 6 — IGCSE 0654 Mar 2025 Paper 42 Q8
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Multiple choice
Electrolysis — Core multiple choice questions22 total · Paper 1
Exercise 1 — IGCSE 0654 Oct/Nov 2025 Paper 11 Q14
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Correct answer: A
Exercise 2 — IGCSE 0654 May/June 2025 Paper 11 Q19
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Correct answer: C
Exercise 3 — IGCSE 0654 Oct/Nov 2025 Paper 11 Q19
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Correct answer: A
Exercise 4 — IGCSE 0654 May/June 2025 Paper 12 Q16
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Correct answer: C
Electrolysis — Extended multiple choice questions25 total · Paper 2
Exercise 5 — IGCSE 0654 Oct/Nov 2025 Paper 21 Q16
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Correct answer: C
Exercise 6 — IGCSE 0654 May/June 2025 Paper 21 Q21
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Correct answer: C
Exercise 7 — IGCSE 0654 Oct/Nov 2025 Paper 22 Q16
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Correct answer: B
Exercise 8 — IGCSE 0654 Oct/Nov 2025 Paper 23 Q14
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Correct answer: B
Alternative to practical
Exercise 1 — IGCSE 0654 May/June 2025 Paper 61 Q4
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