Chemistry
Kinetics is the study of:

The mechanisms and paths of the molecules take in joining from one reactant to products
How fast the reactions go
The rate of chemical reaction
All of these are correct

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Chemistry
Photo chemical smog is a resultant of the reaction among

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

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