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3.4 Electrolysis

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Question 10

A laboratory assistant needs to pass a direct electric current through potassium iodide that is currently solid.

Which preparation will make the ions able to move so that electrolysis can take place?

[1]
A

Dissolve the potassium iodide in water

B

Grind the potassium iodide crystals into smaller pieces

C

Mix the potassium iodide crystals with graphite powder

D

Increase the direct-current supply voltage

Markscheme

3.4 Electrolysis Questions

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

98 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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