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. C F 2 C l 2
● C F 2 C l + C l ● ( free radical ) C F C l 3
● C F C l 2 + C l ● ;
C ● O 3 – – – – – ▶ C l O ● + O 2
C l O ●
C l ● + ● O ;
C l O ● + ● O – – – – – ▶ C l ● + O 2
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