Redox Reactions

Redox Reactions

(i) An overall reaction in which oxidation and reduction takes place simultaneously is called redox or oxidation-reduction reaction. These reactions involve transfer of electrons from one atom to another. Thus every redox reaction is made up of two half reactions; One half reaction represents the oxidation and the other half reaction represents the reduction.

(ii) Types of redox reaction

(a)  Direct redox reaction: The reactions in which oxidation and reduction takes place in the same vessel are called direct redox reactions.

(b) Indirect redox reaction: The reactions in which oxidation and reduction takes place in different vessels are called indirect redox reactions. Indirect redox reactions are the basis of electro-chemical cells.

(c) Intermolecular redox reactions: In which one substance is oxidised while the other is reduced.

For example, 

Here, Al is oxidised to  while is reduced to Fe.

(d) Intramolecular redox reactions: In which one element of a

 

compound is oxidised while the other is reduced.

For example, 

Here,  in  is reduced to  in KCl while  in  is oxidised to .

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