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JEE Main levelSingle correct optionDifficulty 2 of 3ev077

The ozone layer is described as being in dynamic equilibrium. This means that

  1. Aozone is formed and destroyed at equal rates, so its concentration stays nearly steady
  2. Bno ozone is ever destroyed in the stratosphere
  3. Cozone formation stops once the layer is established
  4. Dozone concentration oscillates widely every second

Answer: A

UV photolysis of followed by forms ozone, while photolysis of and reactions with oxygen atoms remove it. When the two rates are equal the concentration is steady.
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