What this practice covers
These questions are drawn from past CIE 0620 Chemistry papers and filtered to redox. 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 redox, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Reading the Roman numeral as the number of atoms in the formula.
- Saying the oxidising agent is oxidised.
- Giving only the oxygen definition on an Extended paper when the reaction involves no oxygen.
- Writing oxidation as the gain of electrons.
- Forgetting that a fall in oxidation number is reduction, and calling +7 to +2 an oxidation because the numbers are both positive.
- Calling neutralisation a redox reaction.
- Saying potassium manganate(VII) turning colourless shows an oxidising agent was added, when it shows the opposite.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Redox revision notes.