Discussion
Which of the following gas is released on incomplete combustion of carbon fuels ?
Answer: A
Incomplete combustion of carbon fuels releases CO.
When there is not enough oxygen, carbon burns only partly: 2C + O2 → 2CO. Carbon monoxide is a poisonous gas because it binds to haemoglobin far more strongly than oxygen.
CO2 is the product of complete combustion. Methane is a fuel or a product of anaerobic decay, not of incomplete burning, and SO4 is a sulphate ion, not a gas from burning carbon fuels.
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