62. Which of these is a naturally occurring radioactive gas that emanates from rocks, soil, and water and can cause lung cancer?
Answer: D
Radon is a naturally occurring radioactive gas that can cause lung cancer.
Radon is a gas produced from the natural decay of uranium found in soil and rock. It can accumulate in homes and buildings, leading to health risks, including lung cancer.
A) Chlordane
Chlordane is a synthetic pesticide that was used for agricultural and residential purposes. It is not a naturally occurring gas and does not pose the same health risks associated with radioactive materials like radon.
B) Carbon monoxide
Carbon monoxide is a colorless, odorless gas produced by burning fossil fuels. While it is toxic and can be deadly in high concentrations, it is not a radioactive gas and does not originate from natural geological processes.
C) Chlorofluorocarbons
Chlorofluorocarbons (CFCs) are man-made chemical compounds used primarily as refrigerants and aerosol propellants. They do not occur naturally in the environment and are unrelated to the risks of lung cancer associated with radon.
D) Radon
Radon is indeed a naturally occurring radioactive gas that is produced from the decay of uranium in soil, rock, and water. It can seep into homes through cracks in floors and walls, creating a significant health hazard due to its association with lung cancer.
Conclusion
Radon is the only option that correctly identifies a naturally occurring radioactive gas linked to lung cancer. In contrast, the other options (Chlordane, Carbon monoxide, and Chlorofluorocarbons) either do not relate to radioactivity or are synthetic in origin, highlighting the unique health risks posed by radon exposure.