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3.4 Electrolysis

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Question 11
F

Copper(II) sulfate solution is electrolysed using graphite electrodes. A student measures the mass of the cathode every few minutes.

The graph shows the results.

image

Which statement is correct?

[1]
A

25.40 g of copper is made, and after 40 minutes the solution stops conducting electricity.

B

0.40 g of copper is made, and after 40 minutes hydrogen is made at the cathode instead.

C

0.40 g of copper is made, and after 40 minutes the cathode is fully coated, so no more copper can form on it.

D

0.40 g of copper is made, and after 40 minutes electrolysis stops because there are no ions left in the solution.

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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