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Electrolysis

Electrolysis

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Question 1

Magnesium is extracted by the electrolysis of molten magnesium chloride, MgCl2\text{MgCl}_2MgCl2​.

Which equation shows the reaction at the anode in this electrolysis?

A

Mg2++2e−→Mg\text{Mg}^{2+} + 2\text{e}^- \rightarrow \text{Mg}Mg2++2e−→Mg

B

2Cl−−2e−→Cl22\text{Cl}^- - 2\text{e}^- \rightarrow \text{Cl}_22Cl−−2e−→Cl2​

C

2H++2e−→H22\text{H}^+ + 2\text{e}^- \rightarrow \text{H}_22H++2e−→H2​

D

4OH−−4e−→O2+2H2O4\text{OH}^- - 4\text{e}^- \rightarrow \text{O}_2 + 2\text{H}_2\text{O}4OH−−4e−→O2​+2H2​O

Markscheme

Electrolysis Questions

  1. GCSE
  2. /Chemistry
  3. /Electrolysis

34 exam-style questions on OCR GCSE Chemistry Electrolysis. Each one has a worked solution and a mark scheme showing where the marks go.

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