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प्रश्न
Gas A, found in the upper layers of the atmosphere, is a deadly poison but is essential for all living beings. The amount of this gas started declining sharply in the 1980s.
- Identify Gas A. How is it formed at higher levels of the atmosphere?
- Why is it essential for all living beings? State the cause for the depletion of this gas.
उत्तर
- Gas A is Ozone. Alternatively, accept the formula of the gas. Ozone at the higher levels of the atmosphere is a product of UV radiation acting on oxygen (O2) molecule. The higher energy UV radiations split apart some molecular oxygen (O2) into free oxygen (O) atoms. These atoms then combine with molecular oxygen to form ozone.
Alternatively, accept the following equations with the correct molecular formulae. No mark to be assigned if molecular formulae are not correct, when only the equation is written.
- Ozone shields the surface of the earth / protects living organisms from ultraviolet (UV) radiation released by the sun.
Chlorofluorocarbons (CFCs) which are used as refrigerants / in fire extinguishers lead to depletion of ozone layer.
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संबंधित प्रश्न
How does ozone affect any ecosystem?
What are the causes of depletion of ozone layer? Which diseases are likely to be caused if the ozone layer will become thinner?
Write the harmful effects of ozone depletion.
Why is ozone layer called ozone umbrella/shield?
Discuss in detail the process of ozone depletion.
Which Gas is present in large amount in the upper part of stratosphere.
Number of Oxygen atom in Ozone.
Name the chemicals responsible for destruction of the ozone layer. State the main chemical from these chemicals, which is responsible for more than 80% ozone depletion.
Select the correct answer from the following statement:
A chemical responsible for ozone depletion.
Write the full form of CFCs.
