Which characteristic is typical for carbon monoxide?

Carbon monoxide is known for being colorless and odorless, which makes it particularly dangerous. This characteristic means that individuals can be exposed to it without any immediate awareness, posing risks in various environments, especially in enclosed spaces where combustion is present. The undetectable nature of carbon monoxide necessitates the use of carbon monoxide detectors in homes and workplaces to ensure safety.

The other attributes mentioned in the options, such as having a strong odor, being highly flammable, or being bright yellow, do not accurately describe carbon monoxide. The lethality of carbon monoxide is often heightened by its lack of sensory indicators, meaning that people can unknowingly inhale this toxic gas, leading to serious health risks or even suffocation. Therefore, understanding this characteristic is crucial for fire investigators and safety professionals in preventing and responding to carbon monoxide-related incidents.