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CBSE Class 12 Chemistry Notes: Enviromental Chemistry – Introduction

by Neepur Garg
April 22, 2019
in 12th Class, Class Notes
Reading Time: 2min read
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In last 2 decades, the study of the phenomena related to the environment has gained enormous importance. Environmental pollution has becomes one of the most important issue of global concern. The branch of chemistry which deals with the study of various chemical phenomena occurring in the environment is called environmental chemistry. It is a must disciplinary science which, refer to the study of sources transport, reactions, effect & fate of certain chemical species on air, water & solid. The accessible components of environment are

(i) Atmosphere
This comprises a blanket of gaseous layer around earth.

(ii) Hydrosphere
This comprises about 96% of earths surface & includes all sources of water like oceans rivers lakes, glaciers, ground water etc.

(iii) Lithosphere
It refers to earths solid crust containing the outer mineral cover. It comprise soil, minerals, organic matter etc.

(iv) Biosphere
It refers to the domain of living organism in covalent with atmosphere hydrosphere as well as lithosphere.
Enviromental Chemistry - Introduction
Illustration 1. Name the different rexampletions of the atmosphere along with their altitudes and temperature ranges.

Solution: Troposphere (0 – 11 km, 15 to 56°C), stratosphere (11 – 50 km, – 56 to – 2°C), mesosphere (50 – 85 km, – 2 to – 92°C), thermosphere (85 – 500 km, – 92 to 1200°C)

Illustration 2. What do you mean by “Inversion temperature” in different rexampleions of the atmosphere?

Solution: When we go from one rexampleion of the atmosphere to the next adjoining rexampleion, the trend of temperature changes from increase to decrease or vice versa. This is called inversion temperature.

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Class 12 Enviromental Chemistry All Topic Notes Class 12 Chemistry All Chapters Notes

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Tags: CBSE NotesClass 12 NotesClass 12thFree Notes

Neepur Garg

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