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3.4 Electrolysis

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Question 23
H

Molten aluminium oxide is electrolysed. The half equations are:

cathode: Al3++3e−→Al\mathrm{Al^{3+} + 3e^{-} \rightarrow Al}Al3++3e−→Al

anode: 2O2−→O2+4e−\mathrm{2O^{2-} \rightarrow O_{2} + 4e^{-}}2O2−→O2​+4e−

For every 3 molecules of oxygen made at the anode, how many atoms of aluminium are made at the cathode?

[1]
A

2

B

3

C

4

D

6

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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