What this practice covers
These questions are drawn from past CIE 0620 Chemistry papers and filtered to group vii properties. 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 group vii properties, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Writing the halogens as single atoms, Cl rather than Cl<sub>2</sub>.
- Saying reactivity increases down Group VII, by carrying the Group I trend across.
- Explaining decreasing reactivity by "fewer electrons" instead of by the outer shell being further from the nucleus and shielded.
- Giving iodine as purple in the solid state, when it is grey-black and only its vapour is purple.
- Saying iodine displaces bromine, which is the reaction that does not happen.
- Confusing the colours of bromine water, which is orange, with an iodine solution, which is brown.
- Forgetting that a displacement reaction is redox, and that the displacing halogen is the oxidising agent.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Group VII properties revision notes.