Chemistry
The manufacturing of iron from iron ore involves the process of

Reduction
Electrolysis
Oxidation
Fractional distillation

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Chemistry
Photo chemical smog is a resultant of the reaction among

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

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