Question 621 Deck Safety

You are correct, the answer is A) Carbon monoxide. Carbon monoxide (CO) is a toxic gas that is a product of incomplete combustion, often present when a fire burns in a closed compartment. This is because in a low oxygen environment, the combustion process is incomplete, resulting in the formation of CO instead of the fully oxidized carbon dioxide (CO2). The other options are incorrect - carbon dioxide (B) is a normal product of complete combustion, hydrogen sulfide (C) is not typically associated with fire, and nitric oxide (D) is not a common byproduct of fires.