What this practice covers
These questions are drawn from past CIE 9701 Chemistry papers and filtered to equilibria. 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 equilibria, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Saying the reaction stops at equilibrium, or that the concentrations become equal.
- Saying a catalyst increases the yield. It changes the rate only, and reaches the same position sooner.
- Applying the pressure rule when both sides have the same number of gas molecules.
- Confusing strong with concentrated. Strong is about dissociation; concentrated is about amount.
- Saying K changes when concentration or pressure changes. Only temperature changes K.
- Leaving the balancing numbers out as powers in the Kc expression.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Equilibria revision notes.