G2 Gas Fitter Practice Exam

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Which gas is a product of incomplete combustion?

Oxygen
Carbon monoxide
Nitrogen
Hydrogen

The correct answer is: Carbon monoxide

Incomplete combustion occurs when there is not enough oxygen available for the fuel to react completely, resulting in the production of various byproducts. Among these byproducts, carbon monoxide is a significant and hazardous gas that is formed. Carbon monoxide is produced when carbon in the fuel reacts with oxygen in a limited supply, leading to an incomplete reaction. Unlike carbon dioxide, which is generated during complete combustion, carbon monoxide is colorless, odorless, and can be toxic to humans and animals, making it a critical concern in applications involving gas-burning appliances. The other gases listed—oxygen, nitrogen, and hydrogen—are not products of incomplete combustion. Oxygen is a reactant needed for combustion, nitrogen is mostly inert in combustion reactions, and hydrogen typically does not appear as a major product in gas combustion processes under normal circumstances. Thus, understanding the chemical processes involved in combustion allows one to recognize carbon monoxide as the correct answer associated with incomplete combustion.