Question:
The oxides of which element are responsible for photochemical smog?
The oxides of which element are responsible for photochemical smog?
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NOx + sunlight → ozone → photochemical smog.
Updated On: Jun 17, 2026
- Sulphur
- Nitrogen
- Carbon
- Chlorine
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The Correct Option is B
Solution and Explanation
Step 1: Photochemical smog is formed in the presence of sunlight.
Step 2: Major reactive species involved are nitrogen oxides (NO and NO$_2$), collectively called NO$_x$.
Step 3: NO$_2$ undergoes photodissociation: \[ NO_2 \xrightarrow{hv} NO + O \]
Step 4: Free oxygen reacts with O$_2$ forming ozone (O$_3$), which contributes to smog formation.
Step 5: Hence nitrogen oxides are responsible.
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