Environmental Chemistry Class 11 Notes - Chapter 14

Studying environmental chemistry plays a significant role. The effect of unwelcomed changes happening in the surrounding that has a negative effect on human beings, plants, and animals.

The pollutants of atmosphere occur in all three states of matter. There are different strategies to study atmospheric pollution viz stratospheric and tropospheric pollution.

  • The lowest region of the atmosphere is Troposphere. Organisms such as man, animal, plants, etc. exist here. This pollution is caused due to oxides of nitrogen, halogens, sulfur, carbon, etc.
  • The layer above troposphere about 50 km above sea level is stratosphere. One of the important constituents of this layer is Ozone.

Depletion Of Ozone Layer

The thickness of the ozone layer in the upper atmosphere of the earth slowly starts decreases due to the industrial gaseous chemical compounds such as bromine or chlorine as well as various human activities. This is called depletion of ozone layer.

Greenhouse Effect

The troposphere which is the lowest layer of the atmosphere, as well as the earth’s surface, warms up due to the existence of carbon dioxide, water vapor, methane, etc. This is called greenhouse effect.


Few Important Questions

  1. What is Biochemical Oxygen Demand? Explain in detail.
  2. Define smog? Distinguish between classical smog and photochemical smog?
  3. Which gas is more dangerous? Carbon monoxide gas or carbon dioxide gas? Explain why?
  4. List the harmful effects of photochemical smog and explain measures to control the same.

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