As fuels
1 mark · EasyState one product, other than carbon dioxide, formed during the incomplete combustion of a hydrocarbon fuel.
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carbon monoxide
Also accept: carbon/soot; C; CO
Common mistakes: oxygen
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Marking points
B1 · 1 mark · States carbon monoxide (or soot/carbon) as a product of incomplete combustion
Worked solution
One product is carbon monoxide.