Question
Chemistry Question on Environmental Chemistry
Biochemical oxygen demand(BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct?
A
Polluted water has BOD value higher than 10 ppm
B
Aerobic bacteria decreases the BOD value
C
Anaerobic bacteria increases the BOD value
D
Clean water has BOD value higher than 10 ppm
Answer
Polluted water has BOD value higher than 10 ppm
Explanation
Solution
Clean water has BOD value less than 5 ppm. Polluted water has BOD value higher than 10 ppm.