Question: When is there ever not enough oxygen for an incomplete combustion ? Edit
Answer: Combustion is a chemical reaction where heat and light are evolved. It is a exothermic reaction.
General Form of a Combustion Reaction
hydrocarbon + oxygen → carbon di oxde + water + Heat
But it is not necessary that in every combustion reaction CO2 will be produced. ( if carbon presents in reactant side CO2 will form in combustion reaction).
CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g) +heat
2 H2 + O2 → 2H2O + heat
2Mg+ O2 --> 2MGO + heat
It sufficient oxygen is not not available there will be partial combustion of fuel which will produce Carbon Mono oxide instead of Carbon Di oxide.
2CH4(g) + 3O2(g) → 2CO(g) + 4 H2O(g) +heat Edit
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