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Environmental Chemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryEnvironmental Chemistry3 Marks
Question
From where does ozone come in the photochemical smog?
✓

Answer

When fossil fuels are burnt, nitric oxide and hydrocarbons from unburnt fuels are produced. In sunlight, nitric oxide is converted to nitrogen dioxide. $\mathrm{NO}_2$ absorbs energy from sunlight and breaks up into NO and free oxygen atoms which are very reactive and combine with $\mathrm{O}_2$ to form $\mathrm{O}_3$, which reacts with NO to form $\mathrm{NO}_2$ and $\mathrm{O}_2$.
$\text{NO}_2\xrightarrow{ \ \ \ \ \text{h}\upsilon\ \ \ }\text{NO}+\text{O}$
$\text{O}+\text{O}_2+\rightleftharpoons\text{O}_3$
$\text{NO}+\text{O}_3\xrightarrow{ \ \ \ \ \ \ \ }\text{NO}_2+\text{O}_2$

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