Chemistry
Photo chemical smog is a resultant of the reaction among

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

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Chemistry
An oxidising agent is a

It releases H2 in a chemical reaction
An electron acceptor
An electron donor
In a chemical reaction its oxidation number increases

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