Virginia Real Estate Exam Practice Question
Which of these is a colorless, odorless, radioactive gas that is released when uranium decays?
Correct Answer: D
Rationale: Radon is a colorless, odorless, radioactive gas that naturally occurs from the decay of uranium in soil and rock. It poses health risks, particularly in enclosed spaces.
Option A, carbon monoxide, is a toxic gas produced from incomplete combustion and is not radioactive. Option B, chlorofluorocarbons (CFCs), are synthetic compounds used in refrigeration and aerosol propellants; they are not gases released from uranium decay. Option C, polychlorinated biphenyls (PCBs), are man-made chemicals used in electrical equipment and are also not related to uranium decay. Thus, only radon fits all criteria in the question.
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