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D D T an exposure to water decomposes. H...

D D T an exposure to water decomposes. Half life = 10 years. How much time will it take for its 99% decomposition?50 years, 66.5 years, 500 years, 700 years

A

50 years

B

70 years

C

500 years

D

700 years

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The correct Answer is:
B
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