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Revision Notes
Air Pollution — Revision Notes
Telangana Open School (TOSS) · Class 12 · Chemistry
Air Pollution revision notes for Telangana Open School (TOSS) Class 12 Chemistry: 4 topics in quick points. Includes Composition of Air, Natural Cycles.
50 questions35 flashcards5 concepts
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Key Topics to Revise
1
Composition of Air
- Clean, dry air is composed mainly of nitrogen (78.9%) and oxygen (20.94%).
- Other gases include carbon dioxide (0.035%), water vapour (0.1–5%), and trace gases like argon, neon, methane, and ozone.
- Non-gaseous components include dust, smoke, salt particles, and pollen.
2
Natural Cycles: Carbon and Nitrogen
- The carbon cycle involves photosynthesis, respiration, and decomposition.
- Photosynthesis: Plants absorb CO₂ and release O₂ using sunlight and chlorophyll.
- Respiration: Organisms use O₂ to break down glucose, releasing CO₂ and energy (ATP).
3
Air Pollutants and Their Sources
- Air pollutants are classified as particulate, liquid droplets, and gaseous pollutants.
- Particulate pollutants: smoke, dust, soot, fly ash, lead, and pollen.
- Gaseous pollutants: SO₂, NOₓ, CO, CO₂, hydrocarbons, and CFCs.
4
Environmental Effects of Air Pollution
- Greenhouse effect: Gases like CO₂, CH₄, and CFCs trap heat and cause global warming.
- Global warming leads to rising sea levels, extreme weather, and habitat loss.
- Ozone depletion: CFCs release chlorine atoms that destroy ozone (O₃) in the stratosphere.
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Full NotesKey Concepts
Clean air is made upCarbon moves between the atmosphereNitrogen gas (N₂) is converted intoGreenhouse gases like CO₂CFCs from refrigerants and aerosols rise
Frequently Asked Questions
What are the important topics in Air Pollution for Telangana Open School (TOSS) Class 12 Chemistry?
Key topics in Air Pollution include Composition of Air, Natural Cycles: Carbon and Nitrogen, Air Pollutants and Their Sources, Environmental Effects of Air Pollution. Study these first, then practise questions on each for the Telangana Open School (TOSS) Class 12 board exam.
How should I revise Air Pollution for the Telangana Open School (TOSS) Class 12 board exam?
Learn the core ideas first, then work through the 50 practice questions on Air Pollution. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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