Chemistry · Class 11 Science
Ch 14Environmental Chemistry — Class 11 Chemistry, concept-first.
Environmental pollution is any undesirable change in our surroundings — air, water or soil — that harms plants, animals and humans. The substance responsible for this harm is called a pollutant.
Key concepts
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Environmental Pollution
Environmental pollution is any undesirable change in the surroundings — air, water or soil — that has harmful effects on plants, animals and human beings.
Most relevant Q&A
Chapter contents
The NCERT structure, section by section. Open a section to see its questions, then read the concept-first solution.
Environmental Pollution
Environmental pollution is any undesirable change in our surroundings — air, water or soil — that harms plants, animals and humans. The substance responsible for this harm is called a pollutant.
Atmospheric Pollution
The atmosphere is not uniform — it is arranged as concentric layers of differing density and composition.
Tropospheric Pollution
Tropospheric pollution arises from undesirable solid or gaseous particles building up in the air we breathe. These fall into two categories:
Stratospheric Pollution
The stratosphere holds a natural reservoir of ozone (O₃) that shields the earth from harmful UV radiation (around 255 nm), which otherwise causes skin cancer (melanoma).
Water Pollution
Water is essential to all life, and we often assume it is pure — but pollution of water sources is a direct consequence of human activity, reaching surface water and groundwater through many different…
Causes of Water Pollution
The most serious water pollutants are disease-causing agents called pathogens — bacteria and other organisms entering water through domestic sewage and animal excreta.
International Standards for Drinking Water
Fluoride concentration in drinking water must be monitored carefully because both too little and too much cause harm.
Soil Pollution
India's economy places high priority on agriculture, fisheries and livestock, and surplus produce is stored by government and non-government bodies for the lean season — but significant food loss occu…
Pesticides
Before World War II, farmers relied on naturally occurring substances such as nicotine (from tobacco plants) to control pests.
Industrial Waste
Industrial solid wastes fall into two broad categories:
Strategies to Control Environmental Pollution
Having studied air, water, soil and industrial-waste pollution, the natural next question is: how can each of us actually help control pollution in our own surroundings? Controlling pollution is not o…
Waste Management
Solid waste is not limited to household garbage — it also includes medical, agricultural, industrial and mining waste.
Green Chemistry
This unit closes by introducing Green Chemistry — the philosophy and set of practices for designing chemical processes and products that minimise pollution and environmental harm at the source, rather…
Introduction
India achieved self-sufficiency in food production in the late 20th century through the use of fertilizers, pesticides, improved farming methods, better seeds and irrigation.
Green Chemistry in day-to-day Life
Tetrachloroethene () was traditionally used as the solvent for dry cleaning, but it contaminates groundwater and is a suspected carcinogen.
Exercises
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- 14.1Define environmental chemistry.Free
- 14.2Explain tropospheric pollution in 100 words.Free
- 14.3Carbon monoxide gas is more dangerous than carbon dioxide gas. Why?Free
- 14.4List gases which are responsible for greenhouse effect.Preview
- 14.5Statues and monuments in India are affected by acid rain. How?Preview
- 14.6What is smog? How is classical smog different from photochemical smogs?Preview
- 14.7Write down the reactions involved during the formation of photochemical smog.Preview
- 14.8What are the harmful effects of photochemical smog and how can they be controlled?Preview
- 14.9What are the reactions involved for ozone layer depletion in the stratosphere?Preview
- 14.10What do you mean by ozone hole? What are its consequences?Preview
- 14.11What are the major causes of water pollution? Explain.Preview
- 14.12Have you ever observed any water pollution in your area? What measures would you suggest to control it?Preview
- 14.13What do you mean by Biochemical Oxygen Demand (BOD)?Preview
- 14.14Do you observe any soil pollution in your neighbourhood? What efforts will you make for controlling the soil pollution?Preview
- 14.15What are pesticides and herbicides? Explain giving examples.Preview
- 14.16What do you mean by green chemistry? How will it help decrease environmental pollution?Preview
- 14.17What would have happened if the greenhouse gases were totally missing in the earth’s atmosphere? Discuss.Preview
- 14.18A large number of fish are suddenly found floating dead on a lake. There is no evidence of toxic dumping but you find an abundance of phytop…Preview
- 14.19How can domestic waste be used as manure?Preview
- 14.20For your agricultural field or garden you have developed a compost producing pit. Discuss the process in the light of bad odour, flies and r…Preview