Which statement describes Carbon Monoxide?

Which statement describes Carbon Monoxide?

• A. A colorless, odorless toxic flammable gas formed by incomplete combustion of carbon
• B. A colorless, odorless gas produced by complete combustion
• C. A green gas produced by photosynthesis
• D. A solid used as a fuel additive

Answer: (A)

Carbon monoxide is formed when a carbon-containing fuel burns with insufficient oxygen. In that situation, not all the carbon turns into carbon dioxide; some of it becomes carbon monoxide, a colorless, odorless gas. Its danger comes from how easily it binds to hemoglobin in the blood, forming carboxyhemoglobin and preventing oxygen from being carried to tissues. That makes CO particularly toxic, especially in enclosed spaces. This description also fits the contrast with complete combustion, which produces carbon dioxide and water rather than carbon monoxide. CO is still flammable in air, adding a fire risk, but the key point is its formation from incomplete combustion and its toxic nature.

Carbon monoxide is formed when a carbon-containing fuel burns with insufficient oxygen. In that situation, not all the carbon turns into carbon dioxide; some of it becomes carbon monoxide, a colorless, odorless gas. Its danger comes from how easily it binds to hemoglobin in the blood, forming carboxyhemoglobin and preventing oxygen from being carried to tissues. That makes CO particularly toxic, especially in enclosed spaces. This description also fits the contrast with complete combustion, which produces carbon dioxide and water rather than carbon monoxide. CO is still flammable in air, adding a fire risk, but the key point is its formation from incomplete combustion and its toxic nature.