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Chemistry · Oct / Nov 2019 · Paper 11 · Question 12

5070Electrolysis

Molten sodium chloride is electrolysed. Which equation correctly shows the reaction that occurs at the cathode?

  1. A2Cl– + 2e– → Cl2
  2. B2Cl– – 2e– → Cl2
  3. CNa+ + e– → Na
  4. DNa+ – e– → Na

As printed in the paper

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Correct answer: C. Na+ + e– → Na

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