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Which of the following statements is wrong?

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$BOD$ value of water is $20 \ ppm$. Then what can you conclude regarding water?

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Assertion : Ozone is destroyed by $CFCs$ in the upper stratosphere. Reason : Ozone holes increase the amount of $UV$ radiation reaching the earth.

Which of the following air pollutants is likely $NOT$ to produce photochemical smog?

Which of the following pollutants does not undergo decomposition by natural processes?

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