The $BOD$ values for pure water and highly polluted water are respectively
- A$> 5 \ ppm, \ \leq 17 \ ppm$
- B$> 5 \ ppm, \ \geq 17 \ ppm$
- C$< 5 \ ppm, \ \geq 17 \ ppm$
- D$< 5 \ ppm, \ \leq 17 \ ppm$
Explore More
Similar Questions
The smog known as London smog is .....
Easy
View SolutionWhich principle of green chemistry highlights that the protection of a selective group is not advantageous?
Match the items in List-$I$ with the items in List-$II$ and select the correct answer from the given options:
List-$I$ List-$II$ $A$. Bleaching of paper $I$. $CF_2Cl_2$ $B$. Eye irritant $II$. $H_2O_2$ $C$. Freons $III$. $Na_2AsO_3$ $D$. Herbicide $IV$. $PAN$ $V$. $CO_2$
| List-$I$ | List-$II$ |
| $A$. Bleaching of paper | $I$. $CF_2Cl_2$ |
| $B$. Eye irritant | $II$. $H_2O_2$ |
| $C$. Freons | $III$. $Na_2AsO_3$ |
| $D$. Herbicide | $IV$. $PAN$ |
| $V$. $CO_2$ |
Dissolved oxygen is essential for aquatic life. What are the reasons responsible for the depletion of dissolved oxygen in water?
Medium
View SolutionStatues and monuments in India are affected by acid rain. How?
Medium
View SolutionVedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo