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Which of the following conditions shows ...

Which of the following conditions shows the polluted enviorment ?

A

eutrophication

B

`0.03 %` of `CO_2` in the atmosphere

C

BOD value of 5 ppm

D

pH of rain water to be 5.6

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JEE MAINS PREVIOUS YEAR ENGLISH-JEE MAINS 2020-CHEMSITRY
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