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Atmospheric Pollution

ICSE · Class 9 · Chemistry

Complete topic list for Atmospheric Pollution in ICSE Class 9 Chemistry. Key concepts, sub-topics, and what to focus on for board exams.

44 questions22 flashcards4 concepts

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An infographic illustrating the classification of pollutants based on their state (solid, liquid, gaseous) and degradability (degradable, slowly degradable, non-degradable) with examples.
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4 Topics · ICSE Class 9 Chemistry

Topics in Atmospheric Pollution

1

Introduction to Environmental Pollution

  • Environment comprises air, water and land - the physical and biological world
  • Pollution is derived from Latin word 'pollutes' meaning 'made dirty'
  • Environmental pollution is the effect of undesirable changes that harm plants, animals and humans
2

Air Pollution and Major Pollutants

  • Air pollution means degradation of air quality due to harmful contaminants
  • Pure air contains 78.08% nitrogen, 20.94% oxygen, 0.93% argon, 0.03% carbon dioxide
  • Major gaseous pollutants: SO₂, H₂S, NO, NO₂, CO, fluorides, hydrocarbons
3

Acid Rain

  • Normal rain pH is 5-6 due to CO₂ forming weak carbonic acid
  • Acid rain pH ranges from 3-5, sometimes as low as 2
  • Caused by oxides of nitrogen and sulphur dissolving in rain water
4

Global Warming and Greenhouse Effect

  • Three-fourths of sun's energy is absorbed by earth's surface
  • Greenhouse gases trap heat in atmosphere causing global warming
  • Major greenhouse gases: CO₂ (50%), CH₄ (19%), CFC (17%), O₃ (8%), N₂O (4%), H₂O (2%)

Key Concepts

Air pollution is the degradationAcid rain occurs when oxidesThe greenhouse effect occurs when greenhouseOzone (O₃) forms in the stratosphere

Frequently Asked Questions

What are the important topics in Atmospheric Pollution for ICSE Class 9 Chemistry?
Atmospheric Pollution covers several key topics that are frequently asked in ICSE Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Atmospheric Pollution — ICSE Class 9 Chemistry?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision 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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