Question

____________ is a colorless, odorless gas that forms when fuels are not completely burned.

Answer 1

Your answer is Carbon monoxide

Answer 2

Step-by-step 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,
`C(s) + (1)/(2)O_(2)(g) \rightarrow CO(g)`

Therefore, we can conclude that carbon monoxide is a colorless, odorless gas that forms when fuels are not completely burned.