Which statement describes carbon monoxide properties?

Which statement describes carbon monoxide properties?

• A. Colorless, Tasteless, and Odorless
• B. Colorful and strong smelling
• C. Heavier than air and has a greenish tint
• D. A solid at room temperature

Answer: (A)

Carbon monoxide is a gas at room temperature that has no color, no taste, and no odor. That combination explains why it’s so dangerous—people can be exposed without any sensory warning and must rely on detectors or monitoring to know it’s present. It isn’t colored or smelling, and it isn’t a solid or a greenish liquid, so those statements don’t describe its true nature. The correct description is that carbon monoxide is colorless, tasteless, and odorless.

Carbon monoxide is a gas at room temperature that has no color, no taste, and no odor. That combination explains why it’s so dangerous—people can be exposed without any sensory warning and must rely on detectors or monitoring to know it’s present. It isn’t colored or smelling, and it isn’t a solid or a greenish liquid, so those statements don’t describe its true nature. The correct description is that carbon monoxide is colorless, tasteless, and odorless.