Which one of the following statements is not true?
- AClean water would have a $BOD$ value of $5 \ ppm$.
- BFluoride deficiency in drinking water is harmful. Soluble fluoride is often used to bring its concentration up to $1 \ ppm$.
- CWhen the $pH$ of rain water is higher than $6.5$,it is called acid rain.
- DDissolved Oxygen $(DO)$ in cold water can reach a concentration up to $10 \ ppm$.
Explore More
Similar Questions
What is acid rain? Explain the formation of acid rain by atmospheric pollutants.
The presence of which of the following is the best indicator of incomplete combustion of petrol or diesel in an automobile engine?
Medium
View SolutionWhich one of the following depletes the ozone layer?
DifficultAIEEE 2012
View SolutionGiven below are two statements:
Statement $I:$ Classical smog occurs in cool humid climate. It is a reducing mixture of smoke,fog and sulphur dioxide.
Statement $II:$ Photochemical smog has components,ozone,nitric oxide,acrolein,formaldehyde,$PAN$ etc.
In the light of above statements,choose the most appropriate answer from the options given below:
Statement $I:$ Classical smog occurs in cool humid climate. It is a reducing mixture of smoke,fog and sulphur dioxide.
Statement $II:$ Photochemical smog has components,ozone,nitric oxide,acrolein,formaldehyde,$PAN$ etc.
In the light of above statements,choose the most appropriate answer from the options given below:
Ozone depletion in the stratosphere is mainly caused by
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