What this practice covers
These questions are drawn from past CIE 0620 Chemistry papers and filtered to hydrogen-oxygen fuel cells. 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 hydrogen-oxygen fuel cells, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Saying the fuel cell produces no products at all. It produces water.
- Saying hydrogen is burned in the cell. It reacts electrochemically and the energy is released as electricity.
- Calling a fuel cell a battery that needs recharging. It runs as long as it is fed.
- Claiming a fuel cell vehicle causes no pollution anywhere, without mentioning how the hydrogen was made.
- Saying hydrogen is easy to store because it is light. Its low density is exactly why storing it is difficult.
- Giving "it is cleaner" as the whole answer instead of naming water as the only product.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Hydrogen-oxygen fuel cells revision notes.