Question

Are Double Displacement reactions redox?

Answer 1

Oxidation is the loss of electrons, while reduction is the gain of electrons. Oxidation-reduction reactions, also known as redox reactions, are reactions in which one reactant is oxidised while the other is reduced during the course of the reaction. A double displacement reaction is a chemical process in which the reactant ions change positions in order to generate new products.

Complete answer:
Double displacement reactions are not redox reactions since neither of the reactant’s oxidation numbers changes. Precipitation is usually formed as a result of a twofold displacement process. Covalent or ionic chemical bonds can form between the reactants. A double displacement reaction, also known as a double replacement reaction, is a chemical process in which two molecules are substituted for one another.
In most cases, double displacement reactions occur in aqueous solutions, where the ions precipitate and an ion exchange occurs. When a solution of barium chloride is mixed with sodium sulphate, a white precipitate of barium sulphate is generated almost immediately. The nature of these reactions is ionic.
$BaC{l_2} + NaS{O_4} \to BaS{O_4} + 2NaCl$
A simple displacement reaction is also a redox reaction because two different elements appear as free elements on one side of the equation and as part of a compound on the other side. Therefore, its oxidation number changes
The reaction is as follows:
$Zn + 2HCl \to ZnC{l_2} + {H_2}$
The more electronegative chlorine displaces iodine from its salt, potassium iodide, in this process. Zinc is oxidised to a $+ 2$ state from a $0$ state, and hydrogen is reduced to a $0$ state from a $+ 1$ state in this reaction.

Note:
Any reaction in which the oxidation number does not change is not a redox reaction. The oxidized element increases in oxidation number while the reduced element decreases in oxidation number.