Which characteristic does carbon monoxide NOT possess?

Carbon monoxide is well known for its dangerous properties, particularly because it is both odourless and colourless, making it difficult for people to detect without specific sensors or alarms. Its tastelessness means that it cannot be detected by the sense of taste, contributing to the risk of exposure without awareness.

While carbon monoxide is indeed flammable, it is important to understand the context of this characteristic in relation to the question. The question specifically asks for a characteristic that carbon monoxide does not possess. Therefore, the fact that carbon monoxide is flammable does not align with the other properties listed, which highlight its more insidious qualities—being undetectable by human senses. The confusion may arise from the general traumas associated with other gases that are not flammable, but in the case of carbon monoxide, its flammability serves as an important aspect of its behavior, especially in combustion processes.

In summary, carbon monoxide is recognised as a dangerous gas that is odourless, colourless, and tasteless. Its flammability is indeed a characteristic, but when focussing on what it does NOT possess among the listed characteristics, it fits within the context of the question as the correct response.