JEE Main202330 Jan 2023Evening ShiftChemistryEnvironmental ChemistryActual
The water quality of a pond was analysed and its BOD was found to be 4 . The pond has
Options
- AHighly polluted water
- BWater has high amount of fluoride compounds
- CVery clean water
- DSlightly polluted water
Correct answer
C. Very clean water
Step-by-step solution
The amount of BOD in the water is a measure of the amount of organic material in the water, in terms of how much oxygen will be required to break it down biologically. Clean water has BOD value of less than 5 ppm whereas polluted water has a BOD value of 17 ppm or more. So, the pond has very clean water.