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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ev103

Which statements correctly describe the formation of the Antarctic ozone hole?

  1. APolar stratospheric clouds form in the extremely cold winter stratosphere.
  2. BReactions on cloud surfaces convert HCl and ClONO2 into and HOCl.
  3. CReturning sunlight in spring photolyses and HOCl to Cl atoms.
  4. DThe is photolysed rapidly during the polar night.

Answer: A, B, C

Cold winter conditions allow clouds to form, on which reservoir chlorine is activated. Sunlight in spring splits and HOCl into Cl atoms, starting the catalytic loss. During the polar night there is no sunlight to photolyse the species, so the last statement is false.
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