Question

Difference between displacement reaction and double displacement reaction with example

Answer 1

In both reactions, a displacement and a replacement occur at the same time. The main difference between displacement and double displacement reaction is that in displacement reaction, a single chemical species is replaced whereas in double displacement reactions, two chemical species are replaced.

Answer 2

Displacement reaction : The reaction in which an element displaces another element from a substance is called “displacement reaction.” It is represented as

AB + C = AC + B

Eg: An + 2HCl = ZnCl2 + H2

In displacement reaction one element displaces another element from its compound and takes its place therein.

Here in above equation hydrogen has displaced from acids by metals.

Double displacement : The reaction in which the constituent atoms of the reaction interchange by the decomposition of the two reactants, to produce new compounds are called double displacement reactions.

They are generally represented as follows.

AB + CD = AC + BD

Eg: MgCl2 + 2KOH = Mg(OH)2 + 2KCl