GED Science Practice

What substance is an odorless, very poisonous gas that is a product of incomplete combustion of carbon?

1. Carbohydrate

2. Carbon Dioxide

3. Carbon Monoxide

4. Cathode

The correct answer is: Carbon Monoxide

Carbon monoxide is an odorless and highly poisonous gas produced during the incomplete combustion of carbon-containing materials. This can occur in situations where there is insufficient oxygen for complete combustion, such as in car engines, gas furnaces, or poorly ventilated fireplaces. Because it is colorless and does not have a smell, it is particularly dangerous as it can accumulate in enclosed spaces without people being aware of its presence. When inhaled, carbon monoxide binds to hemoglobin in the blood more effectively than oxygen, which can lead to serious health consequences, including suffocation, organ damage, or even death, since it prevents the blood from carrying sufficient oxygen to the body’s tissues. In contrast, carbohydrates are organic compounds used by the body for energy, while carbon dioxide is a product of complete combustion and normal cellular respiration, and cathodes refer to a type of electrode in electrochemical cells and are not related to combustion processes. Thus, carbon monoxide is distinctly recognized for its dangerous properties related to incomplete combustion.