What this practice covers
These questions are drawn from past CIE 0620 Chemistry papers and filtered to reversible reactions and equilibrium. 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 reversible reactions and equilibrium, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Saying the concentrations of reactants and products are equal at equilibrium.
- Saying the reactions stop at equilibrium.
- Claiming a catalyst increases the yield of ammonia.
- Giving 450 °C as the condition that maximises yield, when it lowers yield and is chosen for rate.
- Reversing the cobalt(II) chloride colours, which are blue when dry and pink when wet.
- Saying anhydrous copper(II) sulfate turning blue proves the liquid is pure water.
- Counting solids or liquids when applying the pressure rule.
- Applying Le Chatelier to a reaction in an open container, which is not at equilibrium at all.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Reversible reactions and equilibrium revision notes.