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Application of Redox reactions:

Answer Text:
Application of Redox reactions:
1. Extraction of metals;
- Ores of metals such as zinc, iron’ lead etc are roasted in air to form corresponding metal oxides;
- The metal oxides are then reduced to corresponding metals using common reducing agents like carbon and carbon (II) oxide.
Examples:
Zinc (II) oxide + Carbon (II) oxide → Zinc + carbon (IV) oxide;
Atmospheric pollution and percentage composition of air.
- Human activities have changes the normal composition of air in some places;
- This has not only altered the percentage composition of the main components but also added other components
into the air.
Examples:
- Mining increases the amount of dust particles in the air;
- Geothermal power drilling may result into emission of gases like hydrogen sulphide, sulphur (IV) oxide into the air;
- Industrial processes like manufacture of nitric (V) acid, contact process etc may add gases like sulphur (IV) oxide, nitrogen oxides into the air;
These gases and emissions cause atmospheric pollution:
- Gases like sulphur (IV) oxide and nitrogen (IV) oxide dissolve I rain water to form acidic rain that cause corrosion of buildings, iron sheet roofing, bleaching of plants; irritation in bodies and respiratory surfaces in animals etc;
- Dust particles may block stomata in plants; cause smog formation hence reducing visibility (leading to more cases of road accidents).