Q45.The molecule that has minimum or no role in the formation of photochemical smog, is: (1) N2 (2) O3 (3) H2C = O (4) NO
What This Question Tests
This question tests the understanding of Biochemical Oxygen Demand (BOD) as an indicator of water quality and the correlation between BOD values and pollution levels.
Concepts Tested
📚 NCERT Sections This Tests
8.17 — Complete Each Synthesis By Giving Missing Starting Material, Reagent Or Products
Chemistry Class 12 · Chapter 8
8.17 Complete each synthesis by giving missing starting material, reagent or products
5.16 — Draw Figure To Show The Splitting Of D Orbitals In An Octahedral Crystal Field.
Chemistry Class 11 · Chapter 5
5.16 Draw figure to show the splitting of d orbitals in an octahedral crystal field.
1.3 — Define The Following Terms:
Chemistry Class 11 · Chapter 1
1.3 Define the following terms: (i) Mole fraction (ii) Molality (iii) Molarity (iv) Mass percentage.
📋 Question Details
- Chapter
- Environmental Chemistry
- Topic
- Water pollution (BOD)
- Year
- 2019
- Shift
- 12 Jan Shift 1
- Q Number
- Q45
- Type
- MCQ
- NCERT Ref
- Class 12 Chemistry Ch 16: Environmental Chemistry
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Q46.Water sample is reported to be highly polluted if BOD (Biological Oxygen Demand) value of sample becomes (1) more than 17ppm (2) equal to 10ppm (3) equal to 5ppm (4) less than 5ppm