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Ozone layer acts as one of the most impo...

Ozone layer acts as one of the most important life support system. The major cause of ozone layer destruction is believed to be the release of chlorofluorocarbon compounds. UV radiation causes the chlorofluouocarbons to dissociate : `CF_(2) Cl overset(hv)(rarr) Cl* +CF_(2) CI` A highly reactive chlorine atomis responsible for the decomposition of ozone. `Cl* + O_(3) (g) rarr ClO* + O_(2) (g) ClO* + O(g) rarr Cl* + O_(2) (g)` Free radicals of chlorine decompose ozone molecules in a chain reaction. The depletion of ozone layer leading to ozone hole has, however, been mainly observed in the stratosphere over Antarctica. Special type of cloud called polar stratospheric colouds are formed over Antarctica.These clouds (contain solid `HNO_(3).3H_(2)O`) play an important role in ozone depletion.
`ClO* + NO_(2) rarr ClONO_(2) `
`ClONO_(2) + H_(2) O rarr HOCl + HNO_(3) `
` ClONO_(2) + HCl rarr Cl_(2) + HNO_(3)`
`HOCl overset(hv)(rarr) HO* + Cl*`
The reactive chlorine atoms thus formed are rendered to deplete ozone layer.
The ozone layer is present in :

A

troposphere

B

stratosphere

C

mesosphere

D

thermosphere

Text Solution

Verified by Experts

The correct Answer is:
B
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Ozone layer acts as one of the most important life support system. The major cause of ozone layer destruction is believed to be the release of chlorofluorocarbon compounds. UV radiation causes the chlorofluouocarbons to dissociate : CF_(2) Cl overset(hv)(rarr) Cl* +CF_(2) CI A highly reactive chlorine atomis responsible for the decomposition of ozone. Cl* + O_(3) (g) rarr ClO* + O_(2) (g) ClO* + O(g) rarr Cl* + O_(2) (g) Free radicals of chlorine decompose ozone molecules in a chain reaction. The depletion of ozone layer leading to ozone hole has, however, been mainly observed in the stratosphere over Antarctica. Special type of cloud called polar stratospheric colouds are formed over Antarctica.These clouds (contain solid HNO_(3).3H_(2)O ) play an important role in ozone depletion. ClO* + NO_(2) rarr ClONO_(2) ClONO_(2) + H_(2) O rarr HOCl + HNO_(3) ClONO_(2) + HCl rarr Cl_(2) + HNO_(3) HOCl overset(hv)(rarr) HO* + Cl* The reactive chlorine atoms thus formed are rendered to deplete ozone layer. Peeling of ozone umbrella, which protects us from UV rays is caused by:

Depletion of ozone layer cause

Depletion of ozone layer causes

These are responsible for destruction of ozone layer

The thinning of the ozone layer is believed to have begun in