Chemistry
Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has

High nuclear charge
High bond dissociation energy
Stable half filled 2p sub level
Smaller atomic radius

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Chemistry
Photo chemical smog is a resultant of the reaction among

CO, O2 and peroxy acetyl nitrate in the presence of Sunlight
High concentration of NO2, O3, and CO in the evening
CO, CO2 and NO2at low temperature
NO2, O3 and peroxy acetyl nitrate in the presence of Sunlight

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