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Ozone layer of upper atmosphere is being...

Ozone layer of upper atmosphere is being destroyed by

A

chlorofluorocarbons

B

`SO_(2)`

C

`O_(2) " and " CO_(2)`

D

smog.

Text Solution

Verified by Experts

The correct Answer is:
A
CFCs are widely used as refrigerants. CFCs discharged in the lower part of atmosphere move upward and reach stratosphere. In stratosphere, UV rays act on them releasing Cl atoms. Cl degrades ozone releasing molecular oxygen, with these atoms acting merely as catalysts, Cl atoms are not consumed in the reaction. CFCs added to the stratosphere have permanent and continuing affects on ozone levels.
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Knowledge Check

  • The depletion of ozone layer in the upper atmosphere is mainly due to the emission of :

    A
    unburnt hydrocarbons
    B
    chlorofluorocarbons
    C
    greenhouse gases
    D
    ultraviolet radiations

  • Ozone layer above earth's atmosphere will not

    A
    Prevent infrared radiations from sun reaching earth
    B
    Prevent infrared rays reflected from earth from escaping earth's atmosphere
    C
    Prevent ultraviolet rays from sun
    D
    Reflect back radio waves

  • Ozone layer in upper atmosphere (stratosphere) is destroyed by :

    A
    Sulphur dioxide
    B
    Hydrochloric acid
    C
    Photochemical smog
    D
    Chlorofluorocarbon

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