What this practice covers
These questions are drawn from past CIE 0620 Chemistry papers and filtered to fuels. 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 fuels, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Calling ethanol a hydrocarbon. A hydrocarbon contains carbon and hydrogen only.
- Saying fractional distillation separates petroleum into pure compounds. Each fraction is still a mixture.
- Saying the column is cool at the bottom. It is hottest at the bottom, where the vapour enters.
- Saying long-chain molecules rise highest. They have the highest boiling points, so they condense lowest.
- Saying viscosity decreases down the column. It increases; the fractions get thicker.
- Giving naphtha as a fuel. It is the chemical feedstock.
- Naming coal as the main constituent of natural gas. The answer is methane.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Fuels revision notes.