Practise 36 real questions on Electrochemistry from 2021 to 2026. See the answer and explanation as soon as you answer.
Electrochemistry is one of the 12 main topics in our O Level Chemistry (Cambridge (CAIE) 5070) question bank, and about 6% of its real questions come from it. Tayyari Karo has 36 real questions on this topic from 2021 to 2026, from Paper 1, Paper 2, Paper 4; 28 are multiple choice and marked instantly, and the rest are structured questions with a model answer. By difficulty: 33 medium, 3 easy.
Work through the questions below, then open the explanation for each one. Redo the ones you missed a few days later.
These are real past-paper questions. Think of your answer first, then open the explanation.
Molten sodium chloride is electrolysed.
Which change occurs at the cathode?
Answer: B. Sodium ions are reduced.
Positive sodium ions go to the cathode and gain electrons (reduction) to form sodium metal.
Electroplating: object as
Answer: B. cathode
Cathode.
Molten PbBr2 cathode product?
Answer: B. lead
Pb deposited.
Negative ions move to
Answer: A. anode, oxidised
Anions go to anode, lose electrons.
During electrolysis of molten NaCl, at the cathode
Answer: A. Na⁺ + e⁻ → Na
Na⁺ reduced to Na.
Electrolysis of concentrated and dilute NaCl. Which statements are correct? 1 equal volumes in W and X; 2 equal volumes in Y and Z; 3 three different gases.
Answer: D. 1 and 3 only
Concentrated gives Cl₂ + H₂; dilute gives O₂ + H₂; three gases total.
| Session | Paper 1 | Paper 2 | Paper 4 |
|---|---|---|---|
| May/June 2026 | 2 | 1 | – |
| May/June 2025 | 3 | 1 | – |
| Oct/Nov 2025 | 1 | – | – |
| May/June 2024 | 3 | – | – |
| Oct/Nov 2024 | 3 | 1 | 1 |
| May/June 2023 | 2 | 1 | – |
| Oct/Nov 2023 | 3 | 1 | – |
| May/June 2022 | 2 | – | – |
| Oct/Nov 2022 | 3 | – | 2 |
| May/June 2021 | 3 | – | – |
| Oct/Nov 2021 | 3 | – | – |
36 real O Level Chemistry (5070) questions on Electrochemistry from 2021 to 2026, from Paper 1, Paper 2, Paper 4. Each one shows the year, session and paper it came from.
Yes. Every question shows the correct answer and a short explanation the moment you answer.
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