AP EAMCET201920 Apr 2019Evening ShiftChemistryEnvironmental ChemistryActual
Which one of the following statements is not correct?
Options
- ANO ₂ is a lung irritant
- BThe municipal sewage has B O D value of 100-4000 ppm
- CMain source of CO is automobile exhaust fumes
- DCOD is the measure of bacteria in water
Correct answer
D. COD is the measure of bacteria in water
Step-by-step solution
In environmental chemistry, chemical oxygen demand (COD) is the total amount of oxygen, (in ppm) that would be consumed by pollutants in a given water sample measured solution. Thus, COD is useful in terms of water quality. Hence, option (d) is incorrect while the other given statements are correct. i.e. - Municipal sewage has BOD (Biological oxygen demand) value of 100-4000 ppm . - NO ₂ can causes irritation of eyes, noise even lungs. About 70 % CO is mainly from automobiles exhaust fumes.