Answer : The two types of reactions always redox reaction are, Single-displacement reaction and Disproportionation reaction.
Explanation :
Redox reaction or Oxidation-reduction reaction : It is defined as the reaction in which the oxidation and reduction reaction takes place simultaneously.
Single-displacement reaction : It is a type of reaction in which the most reactive element displaces the least reactive element from its compound.
It is type of redox reaction where a species simultaneously oxidized and reduced and form different products.
For example : \(Mg+CuSO_4\rightarrow MgSO_4+Cu\)
In this reaction, oxidation takes place when \(Mg\) lose electrons and form \(Mg^{2+}\) and reduction takes place when \(Cu^{2+}\) gain electrons and form \(Cu\).
Disproportionation reaction : It is a type of chemical reaction in which a molecule is converted or transformed into two or more different products.
It is type of redox reaction where a species simultaneously oxidized and reduced and form different products.
For example : \(2H_2PO_4^-\rightarrow HPO_4^{2-}+H_3PO_4\)
In this reaction, oxidation and reduction reaction takes palace simultaneously by the one species that is, \(H_2PO_4^-\).
In this reaction, oxidation takes place when \(H_2PO_4^-\) lose electrons and form \(HPO_4^{2-}\) and reduction takes place when \(H_2PO_4^-\) gain electrons and form \(H_3PO_4\).
Hence, the two types of reactions always redox reaction are, Single-displacement reaction and Disproportionation reaction.
