Practise comparing hydrogen fuel cells with petrol engines using emissions and efficiency benefits alongside storage, leakage, supply and cost limitations.
This question is about electricity and chemical reactions.
Hydrogen-oxygen fuel cells can be used to produce electricity to power cars. Petrol produces carbon dioxide and carbon monoxide when it powers cars.
State one disadvantage, other than cost, of using hydrogen-oxygen fuel cells to power cars compared to using petrol.
needs high pressure to store hydrogen