What this practice covers
These questions are drawn from past CIE 0654 Co-ordinated Sciences papers and filtered to acids, bases and salts. 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 acids, bases and salts, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Saying an acid produces OH⁻ ions.
- Saying pH 0 is neutral, or that the scale runs 1 to 10.
- Forgetting the water in acid plus base, or the carbon dioxide in acid plus carbonate.
- Saying an acid plus a metal gives water.
- Using excess solid with an alkali, which cannot be filtered off.
- Leaving the indicator in during the final titration, which contaminates the salt.
- Swapping the lighted and glowing splint tests.
- Saying limewater turns milky with any gas. It is specific to carbon dioxide.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Acids, bases and salts revision notes.