JEE Main 2012 Chemistry question

Chemistry Environmental Chemistry JEE Main 2012

Not in JEE Main or NEET syllabus

Water sample is reported to be highly polluted if BOD (Biological Oxygen Demand) value of sample becomes

(1)more than 17ppmCorrect
(2)equal to 10ppm
(3)equal to 5ppm
(4)less than 5ppm

Answer: (1)

Solution

Clean water has BOD below about 5 ppm, whereas highly polluted water has BOD of 17 ppm or more, option (1).

Question ID VK-103490