Q11 / 90 · JEE Main 2022 (28 Jul Shift 1) · Chemistry
Given below are two statements :
Statement I : In polluted water values of both dissolved oxygen and 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
Given below are two statements :
Statement I : In polluted water values of both dissolved oxygen and 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
- 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
- Correct answerDStatement I is false but Statement II is true
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 (Biological oxygen demand), since more organic matter requires more dissolved oxygen to get decompose. Polluted water has BOD grater than 17.
Hence, the correct answer is option: 'D'.