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| Q. |
Supersonic jet causes pollution by thinning of - |
| A. | O3 layer |
| B. | O2 layer |
| C. | SO2 layer |
| D. | CO2 layer |
| Answer» A. O3 layer | |
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Explanation: Three forms (or allotropes) of oxygen are involved in the ozone-oxygen cycle: oxygen atoms (O or atomic oxygen), oxygen has (O2 or diatomic oxygen), and ozone gas (O3 or triatomic oxygen). Ozone is formed in the stratosphere when oxygen molecules photodissociate after absorbing an ultraviolet photon whose wavelength is shorter than 240 nm. This converts a single O2 into two atomic oxygen radicals. The atomic oxygen radicals then combine with separate O2 molecules to create two O3 molecules. |
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