Ozone destroying reaction is
`O_(3)+O rarr 2O_(2)`
This ozone destroying reaction can be due to
(I) `NO` , (II) `CFCs` , (III) `N_(2)`
Select the correct gases.

Options

A. Only II
B. I,II and III
C. Both I and III
D. Both I and II

Answer

D

Explanation

`O_(2)+UV "radiation" rarr O_(2)+O`
`O_(3)+O rarr 2O_(2), Delta H=-390.0 kJ`
In this process, heat is released into the atmosphere.
NO also depletes `O_(3)` layere.
`{:(NO+O_(3)toNO_(2)+O_(2)),(NO_(2)+Oto NO+O_(2)),(ulbar(O_(3)+Oto2O_(2)" ")):}`
`NO` is produced by combustion in supersonic jets operating in the stratosphere.
`CFSs` (chlorofluorocarbons as freons) are being used as refregerants and aerosols. They have very long lifetime and rise to the stratosphere in low concentrations, where they can absorb `UV` radiation and dissociate.
`C Cl_(2)F_(2)+UV "radiation"to overset(● )(C) ClF_(2)+Coverset(● )(l)`
`{:(overset(● )(C)Cl+O_(3)to Cloverset(● )(O)+O_(2)),(Cloverset(● )(O)+OtoCoverset(● )(l)+O_(2)+O_(2)),(O_(3)+Oto2O_(2)):}`