Chemistry
Chile saltpeter is the common name of:

Sodium nitrite
Potassium nitrate
Potassium nitrite
Sodium nitrate

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Chemistry
Photo chemical smog is a resultant of the reaction among

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
CO, O2 and peroxy acetyl nitrate in the presence of Sunlight

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