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Q.

Which of the following statements (I)-(IV) are true about photochemical smog?(I) It occurs in warm, dry and sunny climate.(II) It is formed from the action of sunlight on unsaturated hydrocarbons and oxides of nitrogen.(III) It is called oxidizing smog.(IV) It is called reducing smog.

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a

I, II and IV

b

II, III and IV

c

I, III and IV

d

I, Il and III

answer is D.

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Detailed Solution

(Unburnt hydrocarbons + NO) from automobilesNO  →Sunlight  NO2NO2 →   NO+OO+O2 →   O3O3+NO →   NO2+O2NO2 and O3 both are strong oxidizing agents. Unburnt fuel is oxidized to formaldehyde and acrolein and PAN.CH4 +O3 →   HCHOCH3CH2CH3 →O3  CH2=CHCHO
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