Displacement reaction: A single displacement reaction which is also called as single replacement reaction is a kind of oxidation-reduction chemical reaction when an ion or element moves out of a compound, i.e., one element is replaced by the other in a compound. The reaction occurs as follows
Double displacement reaction: Double displacement reactions occur when a part of two ionic compounds are exchanged and make two new components. Double displacement reactions take place mostly in aqueous solutions wherein the ions precipitate, and exchange of ions takes place.