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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

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The correct Answer is:
B
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Ozone layer acts as one of the most important life support systems. The major cause of ozone layer destruction is believed to be the release of chloroflurocarbon compounds. UV radiation cause the chloroflurocarbons to dissociate: CF_2Cl_2 overset(hv)to Cl^(**) + overset(**)(C)F_2Cl A highly reactive chlorine atom is responsible for the decomposition of ozone. Cl^(**) +O_3 to ClO^(**) + O_(2(g)) ClO^(**) + O_((g)) to 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 clouds are formed over Antarctica. These clouds (contain solid HNO 3H,O) play an important role in ozone depletion. Freon is not recommended to be used in refrigerators because they:

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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. The result of ozone hole is :

    A
    acid rain
    B
    greenhouse effect
    C
    global warming
    D
    the UV radiation reach to carth

  • 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:

    A
    PAN
    B
    `CO_(2)`
    C
    CFCs
    D
    coal burning

  • Ozone layer acts as one of the most important life support systems. The major cause of ozone layer destruction is believed to be the release of chloroflurocarbon compounds. UV radiation cause the chloroflurocarbons to dissociate: CF_2Cl_2 overset(hv)to Cl^(**) + overset(**)(C)F_2Cl A highly reactive chlorine atom is responsible for the decomposition of ozone. Cl^(**) +O_3 to ClO^(**) + O_(2(g)) ClO^(**) + O_((g)) to 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 clouds are formed over Antarctica. These clouds (contain solid HNO 3H,O) play an important role in ozone depletion. Ozone in stratosphere is depleted by

    A
    `C_6F_6`
    B
    `C_7F_(16)`
    C
    `CF_2Cl_2`
    D
    `C_6H_6Cl_6`

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