Choose the correct statement:
Correct answer: A. Ultraviolet radiation from sun causes a reaction that produces ozone
- A. Ultraviolet radiation from sun causes a reaction that produces ozone
- B. Ozone hole is depletion in total amount of O
- C. A single chlorine free radical can destroy 10000 ozone molecules
- D. AII of above
Explanation
Ultraviolet radiations cause photochemical splitting of oxygen molecules in the stratosphere. The nascent oxygen combines with molecular oxygen to form ozone. In troposphere nascent oxygen comes from nitrogen dioxide. Option B is incorrect because ozone depletion does not reduce the amount of oxygen atoms, however it reduces the amount of ozone (O3) by converting it to oxygen gas O2. Option C is incorrect because a single chloride free radical can destroy upto 100,000 ozone molecules.
This question appeared on the NUMS 2014 paper, which you can sit online with every answer explained.
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