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From where ozone come in the photochemical smog? |
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Answer» Solution :(i) Photochemical smog is formed by the combination of SMOKE, dust and fog with air pollutants in the presence of sunlight. (ii) Chemically it is oxidising in nature because of high concentration of oxidising agents such as `NO_(2) and O_(3)`. So it is also called oxidising smog. (iii) Photochemical smog is formed by following reactions: `N_(2) + O_(2) rarr 2NO` `2NO + O_(2) rarr 2NO_(2)` `NO_(2) overset("sunlight")rarr NO + (O)` `(O) + O_(2) rarr O_(3)` `O_(3) + NO rarr NO_(2) + O_(2)` `NO_(2) overset("sunlight")rarr NO + (O)` (iv) No and `O_(3)` are strong oxidising agents and they can REACT with unburnt HYDROCARBONS in polluted air to FORM formaldehyde, acrolein and PAN. |
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