What this practice covers
These questions are drawn from past CIE 9701 Chemistry 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 an oxidising agent is oxidised. It is reduced, because it takes electrons from something else.
- Giving oxygen -2 in hydrogen peroxide. It is -1 there.
- Balancing a redox equation for atoms only. The charge must balance as well.
- Saying the cathode is positive. In electrolysis it is negative, and reduction happens there.
- Calling any reaction where one thing is oxidised and another reduced disproportionation. It has to be the same element doing both.
- Forgetting that a solid ionic compound does not conduct, so it must be molten or in solution.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Electrochemistry revision notes.