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प्रश्न
State the chemicals responsible for ozone layer destruction.
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उत्तर
Chemicals responsible for the destruction of the ozone layer:
(1) Excessive use of CFCs:
CFCs enter the atmosphere because of their excessive use in solvents, aerosol sprays, propellants, refrigerants and blowing agents for plastic foams.
CFCs are decomposed by UV rays to highly reactive chlorine which is produced in the atomic form.
CF2Cl2(g) → CF2Cl(g) + Cl(g)
This free radical [Cl] reacts with ozone, and chlorine monoxide is formed.
Cl(g) + O3(g) → ClO(g) + O2(g)
This causes depletion of ozone, and chlorine monoxide further reacts with atomic oxygen to produce more free radicals of chlorine.
ClO(g) + O(g) → Cl(g) + O2(g)
Again this free radical [Cl] destroys ozone, and the process continues giving rise to large-scale ozone depletion.
(2) The fuel of planes:
When the fuel of planes burns, a large quantity of nitric oxide and other gases is emitted in the atmosphere. Nitric oxide reacts with ozone to form nitrogen dioxide and nitrogen trioxide.
NO(g) + O3(g) → NO2(g) + O2(g)
NO2(g) + O3(g) → NO3(g) + O2(g)
This also causes depletion of ozone.
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संबंधित प्रश्न
What is the function of ozone in the upper atmosphere?
The harmful radiations absorbed by the ozone layer are ______.
How does ozone layer protect us from harmful effects in the environment?
How is ozone formed in the higher level of atmosphere?
How are CFCs harmful?
Fill in the Blanks:
The ______ is the layer of the atmosphere that contains the protective ozone layer
How is the ‘ozone oxygen cycle’ maintained in the stratosphere and state what disturbs the balance, resulting in ozone depletion or destruction, Give balanced equation for the same.
Enumerate methods of protecting the ozone layer and preventing its depletion.
Select the correct answer from the following statement:
The gas which in presence of U.V. light gives two atoms of the same gas.
Name or state the following:
The atom which reacts with oxygen to form ozone.
