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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
Why is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage?
Ozone depletion is occurring widely in the stratosphere; it leads to an ozone hole caused mainly due to ______.
The gas A is used by most of the animals to obtain energy from food by the process of respiration. When A is acted upon by radiation X, it gets converted into another gas B which is an allotrope of A but poisonous when inhaled. B forms a kind of layer C in the upper atmosphere which absorbs radiations X coming from a source Y and prevent them from reaching the earth. Some chemicals Z released from the various devices on the earth are destroying the layer C slowly. In fact, a hole has already been formed in layer C over the area D of the earth.
(a) What are gases (i) A, and (ii) B? Write their molecular formulae.
(b) Name the layer C.
(c) What are (i) X, (ii) Y, and (iii) Z?
(d) Name the area D.
(e) Name any two human ailments which may be caused by X.
Which of the following harmful radiation is absorbed by the ozone layer of the stratosphere?
Is ozone depletion related to global warming?
Number of Oxygen atom in Ozone.
Select the correct answer from the following statement:
The gas which in presence of U.V. light gives two atoms of the same gas.
Give reason for the following:
Destruction of ozone layer is harmful for both humans and plants.
Which of the following radiations is responsible for the conversion of atmospheric oxygen to ozone?
Global warming is a phenomenon related to ______.
