Explain applications of Redox Reactions?

Explanation

Extration of Metals: By using a suitable reducing agent, metal oxides can be reduced to metals. For example `Fe_2O_3` is reduced to iron in the blast furnace, using coke as the reducing agent.
`Fe_2O_(3(a))+3CO to2Fe_((s))+3CO_((s))`
Similarly, `Al_2O_3` is reduced to aluminium by cathodic reduction in an electrotic cell. Other metals such as lithium, sodium, potassium, magnesium,calcium etc. are also obtained commerically by electrolytic methods.
Electrochemical cells or batteries: Electrochemical cells or batteries based on redox reactions are widely used in our day-to-day. life to run a number of small and big gadgets and equipments, For example, storage cells are used to supply all the electrical needs of our cars. truck,buses , train aeroplanes etc. SImilarly electrical energy needed in the space capsule is obtained by the reaction of hydrogen and oxygen in fuel cells which are electro chemical cells using oxygen and hydrogen electrodes.
3. Photosynthesis: Green plants convert carbon dioxide and water into carbohydrates in the presence of sunlight. This reaction is called photosynthesis and is sensitized by chlorophyll.
`6CO_(2(g))+6H_2O_((1)) underset(chlorophyll)overset(sunlight)to underset(carbohydrate) (C_6H_12O_(6(sq)))+6O_(2(sq))`
During this reaction, `CO_2` is reduced to carbohydrates while water is oxidized to oxygen. The energy needed for the reaction is provided by sunlight.
THis reaction is a source of food for plants and animals . IT also maintains a constant supply of 21% of `O_2` by volume in the atmosphere needed for combustion of fuels and breathing of its living creatures in the world.
Supply of energy: The energy required for our daily needs is obtained by oxidation of fuels. For example, oxidation of fuels such as wood, gas , kerosene, petrol etc. produces a large amount of energy which we need for various purposes in our daily life.
Fuels (wood, petrol , kerosene, gas) `+O_2 to CO_2 +H_2O`+ other products + Energy
Human body also needs energy for proper functioning . THis is obtained by oxidation of glucose in our body to `Co_2` and water
`C_6H_12O_(6(sq))to6CO_(2(g))O_((1))+En ergy`
5. Production of chemicals: Many chemicals of our daily needs such as caustic soda, chlorine, fluorine etc, are produced by electrolysis which is based on redox reaction.
Quantative analysis: Redox reactions are very useful in quantative analysis by redox titrations. These titrations involve the reactions between oxidizing and reducing agents and help in estimating the amount of unknown substances in solutions.