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The pollutants that contribute to the depletion of the ozone layer…

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BIOLOGY

The pollutants that contribute to the depletion of the ozone layer in the atmosphere are

A. radioactive materials

B. oxides of sulphur

C. oxides of carbon

D. chlorofluorocarbons

QUICK ANSWER…

D

DETAILS…  

Pay careful attention to this and avoid common mistakes when it comes to issues of ozone depletion.

There’s a big difference between ozone layer depletion and global warming. While the accumulation of oxides of carbon in the atmosphere can retain heat and cause global warming, CO2 and CO do not actually attack our ozone layer.

Chlorofluorocarbons are notorious chemicals usually released into the atmosphere from air conditioners, refrigerants, and cooling systems. Chlorofluorocarbons disintegrate in the atmosphere to give off free chlorine (Cl2) which then attacks the ozone (O3), reacting with it to form ordinary oxygen.

Now for the right answer to the above question:

  1. A is not the right answer. radioactive materials are pollutants in themselves, but they do not attack the ozone layer. Please understand the question.
  2. B is incorrect. oxides of sulphur do not react with ozone; they can only react with atmospheric water to form acid rain.
  3. C is incorrect. oxides of carbon do not also directly react with ozone; they can only accumulate to retain heat thereby causing global warming.
  4. D is correct. chlorofluorocarbons directly attack ozone.
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KEY-POINTS…

You may please note this/these:

  • Chlorofluorocarbons manage to destroy our dear ozone layer by releasing free halogens that attack and react with it, reducing it into ordinary oxygen.
  • Oxides of carbon does not directly react with ozone; they only cause global warming by retaining heat.
  • Global warming is different from ozone attack.
  • Ozone attack is one of the things that could lead to global warming.
  • When ozone depletes, unwanted ultraviolet rays from the sun would no longer be prevented from reaching the earth, resulting in global warming.

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/ culled from 2019 JAMB-UTME biology past question 12 /

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