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4.2 Electrolytic processes

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Question 18
F

An impure copper anode contains copper, zinc and silver.

During purification, the anode loses 12.0 g in mass and the pure copper cathode gains 10.8 g. The zinc dissolves into the solution and is not deposited. The silver falls to the bottom as 0.60 g of sludge. All the copper that leaves the anode is deposited on the cathode.

What is the percentage by mass of zinc in the part of the anode that was used up?

[1]
A

15.0%

B

10.0%

C

5.6%

D

5.0%

Markscheme

4.2 Electrolytic processes Questions

  1. GCSE
  2. /Chemistry
  3. /4.2 Electrolytic processes

52 exam-style questions on Edexcel GCSE Chemistry 4.2 Electrolytic processes, covering 4.2.1 Electrolytes and the process of electrolysis, 4.2.2 Products of electrolysis using inert electrodes, 4.2.3 Half equations, oxidation and reduction in electrolysis, and 4.2.4 Electrolysis of copper sulfate and purifying copper. Each one has a worked solution and a mark scheme showing where the marks go.

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