Environmental Concerns
Kerala Board · Class 12 · Chemistry
Quick revision notes for Environmental Concerns — Kerala Board Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Components and Segments of Environment
- Environment consists of biotic (living organisms like bacteria, plants, animals) and abiotic (air, water, soil, energy) components
- Four segments of environment: Biosphere (life-supporting region), Atmosphere (gaseous envelope), Hydrosphere (water resources), Lithosphere (solid earth with minerals and soil)
- Biosphere depends on delicate balance between organisms and environmental components
Environmental Threats and Chemical Reactions
- Vehicular combustion releases CO, CO₂, and SO₂ into atmosphere
- Acid rain formation: SO₂ + H₂O → H₂SO₄ (sulfuric acid)
- Pesticides like DDT and dieldrin are non-biodegradable pollutants
Types and Classification of Pollutants
- Pollutants classified as Natural and Anthropogenic (man-made)
- Natural pollutants: forest fire CO₂, volcanic SO₂, soil erosion particles, natural radioactivity
- Anthropogenic pollutants further divided into Primary and Secondary
Sources and Effects of Pollutants
- Sources classified as Stationary (fixed location: power plants, factories) and Mobile (moving: vehicles, aircraft)
- Air pollutants: SO₂ (acid rain, eye irritation), CO/CO₂ (global warming, hemoglobin binding), smoke/ash (respiratory diseases)
- Heavy metals: Lead and Mercury affect nervous system, CFCs cause kidney damage and ozone depletion
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What are the important topics in Environmental Concerns for Kerala Board Class 12 Chemistry?
Environmental Concerns covers several key topics that are frequently asked in Kerala Board Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
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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
- Kerala Board of Public Examinations — keralapareekshabhavan.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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