____________ is a colorless, odorless gas that forms when fuels are not completely burned.
2 answers:
Explanation:
Carbon monoxide is a toxic and flammable gas which is also colorless. Chemical formula of carbon monoxide is CO.
This gas is produced upon incomplete combustion of carbon.
For example, 
Therefore, we can conclude that carbon monoxide is a colorless, odorless gas that forms when fuels are not completely burned.
Your answer is Carbon monoxide
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