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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
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.
What would be the effects on widening of ozone hole?
Number of Oxygen atom in Ozone.
Fill in the Blanks:
The ______ is the layer of the atmosphere that contains the protective ozone layer
Give balanced equations for formation of ozone molecules from oxygen molecules. What type of reaction takes place, during the formation.
Enumerate the damage to humans, animals and plants caused due to ozone depletion.
Give balanced equation for the following conversion [one or two steps].
Oxygen to ozone gas by photolysis.
Long answer type question
Montreal protocol is an essential step. Why is it so?
Bad ozone is present in ______
