Illinois Real Estate Exam Practice Question
Which of the following is a radioactive odorless gas?
Correct Answer: A
Rationale: Radon is a naturally occurring radioactive gas that is colorless and odorless, making it a significant health concern in enclosed spaces. Asbestos, while hazardous, is a mineral fiber and not a gas. Formaldehyde is a colorless gas with a strong odor, commonly used in building materials, but it is not radioactive. Carbon monoxide is a colorless, odorless gas produced by incomplete combustion, but it also lacks radioactivity. Therefore, radon is the only option that fits the criteria of being a radioactive, odorless gas.
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