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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 | |
Explanation: Thorium, a naturally occurring radioactive element, four times more abundant than uranium in the earth's crust. |
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