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  4. The water quality of a pond was analysed and its BOD was found to be 4 . The pond has

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Q. The water quality of a pond was analysed and its $BOD$ was found to be $4$ . The pond has

JEE MainJEE Main 2023Environmental Chemistry

Solution:

Clean water as BOD value of $< 5 $ while polluted water has BOD of $15 $ or more.