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| Q. |
Which adioactive pollutant has recently drawn the attention of the public due to its occurrence in the building materials? |
| A. | Radium |
| B. | Radon |
| C. | Thorium |
| D. | Rlutonium |
| Answer» C. Thorium | |
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Explanation: Thorium, a naturally occurring radioactive element, four times more abundant than uranium in the earth's crust. |
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