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प्रश्न
State how CFCs break ozone in the stratosphere.
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उत्तर
Depletion of 03 (ozone) by CFCs:
CFC [CFCl3 ] is broken by UV of sunlight to produce [Cl] atom or free radical [Cl] which highiy reactive in the atomic form and forms C10[g] with O2
\[\ce{CFCl3 ->[UV(Sum)] CFCl2 + Cl [atom]}\]
C l [g] + O3[g] → ClO[g] + O2[g]
This depletes ozone.
CIO further produces more [Cl] free radical
Cl0[g] + O[g] → Cl[g] O2[g] and destroys more of O3 and there by giving rise of ozone depletion.
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संबंधित प्रश्न
The harmful radiations absorbed by the ozone layer are ______.
Explain how, harmful ultraviolet radiations of sunlight are prevented from reaching the earth's surface.
What step has been taken by UNEP in 1987 to prevent too much damage to the ozone layer?
The excessive exposure of humans to ultraviolet rays results in:
- damage to immune system
- damage to lungs
- skin cancer
- peptic ulcers
Match the items in column I with the closely related ones in column II.
| Column I | Column II | ||
| (i) | Chlorofluorocarbons (CFCs) | (a) | Global warming |
| (ii) | Fly ash | (b) | Biodegradable |
| (iii) | Cow dung | (c) | Nuclear radiation pollutant |
| (iv) | CO2 and methane | (d) | Acid rain |
| (v) | Sulphur dioxide | (e) | Industrial waste |
| (vi) | Iodine-131 | (f) | Ozone depletion |
What is Ozone?
Is ozone depletion related to global warming?
Give reason for the following:
The formation of ozone involves a chemical reaction called photolysis.
Why was there a sharp in the amount of ozone in the atmosphere in 1980’s.
Write the full form of CFCs.
