What this practice covers
These questions are drawn from past CIE 9701 Chemistry papers and filtered to nitrogen and sulfur. 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 nitrogen and sulfur, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Explaining nitrogen's unreactivity by saying it is a gas. The reason is the strong triple bond and the non-polar molecule.
- Giving the ammonia bond angle as 109.5°. The lone pair reduces it to 107°.
- Saying the Haber catalyst increases the yield. It increases the rate only.
- Saying a high temperature is used in the Haber process for a better yield. It lowers the yield and is used for rate.
- Adding SO₃ directly to water in the Contact process. It is absorbed in concentrated sulfuric acid first.
- Confusing the pressures: high in the Haber process, low in the Contact process, and knowing why the answer differs.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Nitrogen and sulfur revision notes.