O-LevelChemistryElectrolysis5070/12 · Oct/Nov 2014 · Q121 Mark

What is the correct equation for the reaction taking place at the negative electrode when molten magnesium chloride is electrolysed using inert electrodes?

ACl → Cl + e⁻

B2Cl⁻ → Cl2 + 2e⁻

CMg⁺ + e⁻ → Mg

DMg²⁺ + 2e⁻ → Mg

✓ Correct answer

D: Mg²⁺ + 2e⁻ → Mg

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Topic: Electrolysis, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2014 Paper 1 Variant 2, question 12.

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