What this practice covers
These questions are drawn from past CIE 0654 Co-ordinated Sciences papers and filtered to electrochemistry. You answer, you find out immediately whether you were right, and you get the reasoning for the correct option and for each distractor. Wrong answers go to a mistakes locker so you can come back to exactly those.
Practice is free. You need an account only so your progress and your mistakes are still there next time.
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What examiners see students get wrong here
These are the errors that cost marks on electrochemistry, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Saying oxidation happens at the cathode.
- Saying the anode is negative.
- Saying anions are oxidised by gaining electrons. Oxidation is losing electrons.
- Saying oxygen is produced at the negative electrode.
- Putting the metal at the anode, when metal ions are positive and are repelled by a positive electrode.
- Saying electrons travel through the electrolyte.
- Applying the molten rule to a solution, so that sodium appears at the cathode from sodium chloride solution.
- Forgetting that a dilute chloride solution gives oxygen rather than chlorine.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Electrochemistry revision notes.