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3.4 Electrolysis

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Question 13
F

Potassium sulfate solution, K2SO4(aq)\mathrm{K_{2}SO_{4}(aq)}K2​SO4​(aq), is electrolysed using inert electrodes.

Which half equation shows the reaction at the anode?

[1]
A

4OH−→O2+2H2O+4e−\mathrm{4OH^{-} \rightarrow O_{2} + 2H_{2}O + 4e^{-}}4OH−→O2​+2H2​O+4e−

B

4OH−+4e−→O2+2H2O\mathrm{4OH^{-} + 4e^{-} \rightarrow O_{2} + 2H_{2}O}4OH−+4e−→O2​+2H2​O

C

SO42−→SO4+2e−\mathrm{SO_{4}^{2-} \rightarrow SO_{4} + 2e^{-}}SO42−​→SO4​+2e−

D

2H++2e−→H2\mathrm{2H^{+} + 2e^{-} \rightarrow H_{2}}2H++2e−→H2​

Markscheme

3.4 Electrolysis Questions

  1. GCSE
  2. /Chemistry
  3. /3.4 Electrolysis

52 exam-style questions on OCR GCSE Chemistry 3.4 Electrolysis, covering 3.4.1 Products formed at the electrodes in electrolysis and 3.4.2 The technique of electrolysis. Each one has a worked solution and a mark scheme showing where the marks go.

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