Browse by Stream
-
Engineering and Architecture
Exams
Colleges
Predictors
Resources
-
Computer Application and IT
Quick Links
Colleges
-
Pharmacy
Colleges
Resources
-
Hospitality and Tourism
Colleges
Resources
Diploma Colleges
-
Competition
Other Exams
Resources
-
School
Exams
Top Schools
Products & Resources
-
Study Abroad
Top Countries
Resources
-
Arts, Commerce & Sciences
Colleges
Upcoming Events
Resources
-
Management and Business Administration
Colleges & Courses
Predictors
-
Learn
Law Preparation
MBA Preparation
Engineering Preparation
Medical Preparation
-
Online Courses and Certifications
Top Streams
Specializations
- Digital Marketing Certification Courses
- Cyber Security Certification Courses
- Artificial Intelligence Certification Courses
- Business Analytics Certification Courses
- Data Science Certification Courses
- Cloud Computing Certification Courses
- Machine Learning Certification Courses
- View All Certification Courses
Resources
-
Medicine and Allied Sciences
Colleges
Predictors
Resources
-
Law
Resources
Colleges
-
Animation and Design
Exams
Predictors & Articles
Colleges
Resources
-
Media, Mass Communication and Journalism
Colleges
Resources
-
Finance & Accounts
Top Courses & Careers
Colleges
Get Answers to all your Questions
- #National Eligibility Cum Entrance Test
- #Environmental Chemistry
- #Chemistry
- #Medical
- #Class 11
- #All India Pre Medical Test
Which of the following statement is not true?
Option: 1
pH of drinking water should be between 5.5-9.5
Option: 2
Concentration of DO below 6 ppm is good for the growth of fish
Option: 3
Clean water would have BOD value of less than 5 ppm
Option: 4
Oxides of sulphur, nitrogen and carbon are the most widespread air pollutant
Answers (1)
Dissolved oxygen (DO) -
Amount of oxygen that water can hold in the solution
- wherein
DO in cold water = 10 ppm.
Biochemical oxygen demand (BOD) -
The amount of oxygen required for five days in one litre of water at 200 C for the microorganisms to metabolite organic waste.
- wherein
Clear water has BOD less than 5 ppm , highly polluted water has BOD of 17 ppm or more.
Concentartion of dissolved oxygen below 6ppm hindered the growth of fishes.
View full answer
NEET 2024 Most scoring concepts
- Just Study 32% of the NEET syllabus and Score up to 100% marks
Trending Articles/News
Latest Question
- (i) By the transfer of electrons, illustrate the formation of bond in magnesium chloride and identify the ions present in this compound. (ii) Ionic compounds are solids. Give reasons.
- A charge of 6 µC is given to a hollow metallic sphere of radius 0.2 m. Find the potential at (1) the surface and (ii) the centre of the sphere.
