Answer :

Oxidation:


The reactions in which oxygen or a more electronegative elements are added to any substance.


Or


The reactions in which oxygen or a more electronegative elements are added to any substance.


Or


Process in which a chemical species losses electrons.


Reduction:


The reactions in which oxygen or more electronegative elements are removed from any substance.


Or


The reactions in which hydrogen or a more electropositive elements are added to any substance.


Or


Process in which a chemical species gains electrons.


The reactions in which both oxidation and reduction takes place simultaneously are known as oxidation reduction reactions.


Ex- Fe2O3 + 3CO 2Fe + 3CO2


In the above reaction ferric oxide (Fe2O3) is reduced into iron (Fe) by losing the oxygen atoms attached to it and carbon monoxide (CO) is oxidized into carbon dioxide (CO2) by gaining the oxygen atoms. Hence, it is an oxidation reduction reaction.


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