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Standard VIII
Chemistry
Measures to Reduce Air Pollution
Q. Consider t...
Question

Q. Consider the following statements regarding polar stratospheric clouds:

Which of the above statements is/are correct?


A
1 only
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B
2 only
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C
Both 1 and 2
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D
Neither 1 nor 2
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Solution

The correct option is D Neither 1 nor 2

Explanation:

Statement 1 is incorrect:

  • They are more intense at the South Pole.
  • In the 1980s atmospheric scientists working in Antarctica reported about the depletion of the ozone layer commonly known as the ozone hole over the South Pole.

Statement 2 is incorrect:

  • They promote ozone holes.
  • Polar stratospheric clouds provide a surface on which chlorine nitrate is hydrolyzed to form hypochlorous acid. It also reacts with hydrogen chloride produced to give molecular chlorine.
  • Hence, they promote ozone depletion.

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Q. Polar stratospheric clouds (PSCs) are formed when temperatures fall so low that water vapour and several other types of molecules in the stratosphere condense into extremely small icy particles. Diatomic molecules have a high tendency to bind to these PSCs and rise up into the atmosphere.

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