JEE Main202228 Jul 2022Morning ShiftChemistryEnvironmental ChemistryActual
Given below are two statements : Statement I : In polluted water values of both dissolved oxygen and BOD are very low. Statement II : Eutrophication results in decrease in the amount of dissolved oxygen. In the light of the above statements, choose the most appropriate answer from the options given below
Options
- ABoth Statement I and Statement II are true
- BBoth Statement I and Statement II are false
- CStatement I is true but Statement II is false
- DStatement I is false but Statement II is true
Correct answer
D. Statement I is false but Statement II is true
Step-by-step solution
Since eutrophication is result of excessive growth of weed in water bodies, which consume dissolved oxygen of water bodies. So, Eutrophication decreases amount of dissolved oxygen in water bodies. Polluted water has low value of dissolved oxygen, but high value of BOD (Biological oxygen demand), since more organic matter requires more dissolved oxygen to get decompose. Polluted water has BOD grater than 17.