JEE Main202124 Feb 2021Evening ShiftChemistryEnvironmental ChemistryActual
Given below are two statements: Statement I: The value of the parameter "Biochemical Oxygen Demand (BOD)" is important for survival of aquatic life. Statement II: The optimum value of BOD is 6 . 5 ppm . In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- AStatement I is true but Statement II is false
- BStatement I is false but Statement II is true
- CBoth Statement I and Statement II are false
- DBoth Statement I and Statement II are true
Correct answer
A. Statement I is true but Statement II is false
Step-by-step solution
Clean water would have BOD value of less than 5 ppm whereas highly polluted water could have a BOD value of 17   ppm or more. For survival of aquatic life dissolved oxygen is responsible its optimum limit 6 . 5   ppm and optimum limit of BOD ranges from 10 - 20   ppm & BOD stands for biochemical oxygen demand.