JEE Main 2022 Chemistry question
Not in JEE Main or NEET syllabus
The measured BOD values for four different water samples (A-D) are as follows: A = 3 ppm; B = 18 ppm; C = 21 ppm; D = 4 ppm. The water samples which can be called as highly polluted with organic wastes, are
Answer: (3)
Solution
Highly polluted water has a BOD value of 17 ppm or more, so the samples B (18 ppm) and C (21 ppm) are highly polluted.