NCERT Class XII Chemistry
Chapter - The p-Block Elements
Questions with Solutions

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Question : 20
Total: 74
Which aerosols deplete ozone?
Solution:  
CFC – Chlorofluorocarbon (freons) : These compounds commonlyknown as freons are introduced into the atmosphere from aerosolsprays and refrigerating equipments. They undergo photochemicaldecomposition and destroy ozone as shown by the followingsequenceofreactions.
CF2Cl2
hυ
C
F2
C
l
+Cl(freeradical)
CFCl3
hυ
C
F
C
l2
+Cl
;

CO3ClO+O2
ClO
slow
C
l
+O
;

ClO+OCl+O2
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