Redox-reactions

(i) An overall reaction in which oxidation and reduction takes place simultaneously is called redox or the oxidation-reduction reaction. These reactions include transfer of electrons from one atom to another. Therefore every redox reaction is made up of the two half reactions; One half reaction represents the oxidation and the other half reaction represents 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. The 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 Al₂O₃ while Fe₂O₃ is reduced to Fe.

(d) The Intramolecular redox reactions : In which one element of the compound is oxidised while the other is reduced.

For example, 

Here, Cl⁵⁺ in KClO₃ is reduced to Cl^-1 in KCl while O^2- in KClO₃ is oxidised to O⁰₂.

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