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

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Chemistry
Peptization is a process of

Purification of colloids
Dispersing precipitates into colloidal solution
Protection of colloidal solution
Precipitation of colloidal particles

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