Which term matches the definition: An odorless very poisonous gas that is a product of incomplete combustion of carbon?

• A. Concussion
• B. Carbon Monoxide
• C. UV Rays
• D. Fire Triangle

Answer: (B)

Carbon monoxide is the gas described. It is odorless and highly poisonous, and it forms when carbon-containing fuels don’t burn completely due to limited oxygen or other disruption in the combustion process. Its danger lies in how it affects the body: it binds to hemoglobin with a much higher affinity than oxygen, forming carboxyhemoglobin and preventing normal oxygen delivery to tissues. This can lead to headaches, dizziness, confusion, and even loss of consciousness or death with higher exposure. Because it has no odor or color, people can be unaware of exposure, which is why detectors and proper ventilation are essential for safety around engines, furnaces, and generators. The other terms don’t fit this description: concussion is a brain injury, UV rays are a type of radiation, and the fire triangle is a fire-physics concept, not a poisonous gas.