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Air Pollution

Telangana Open School (TOSS) · Class 12 · Chemistry

Quick revision notes for Air Pollution — Telangana Open School (TOSS) Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

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 Notes

Key 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?
Air Pollution covers several key topics that are frequently asked in Telangana Open School (TOSS) Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Air Pollution — Telangana Open School (TOSS) Class 12 Chemistry?
Understand the core concepts first, then work through the 50 practice questions available for this chapter. Revise formulas and 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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