Reactions in which there is an exchange of ions between the reactants are called Double Displacement Reaction.
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Those reactions in which two compounds react by an exchange of ions to form two new compounds are called double displacement reactions. In double replacement reactions, the positive ions exchange negative ion partners. A double replacement reaction is represented by the general equation.AB + CD → AD + CBIn a double displacement reaction, atoms from two different compounds switch places. The reactants are two compounds and the products are two different compounds. Double displacement reactions can also be called double replacement reactions.Fe2O3\xa0+ 6HCl → 2FeCl3\xa0+ 3H2OMany double displacement reactions occur between ionic compounds that are dissolved in water.

It is that reactions in which the compound reacts of exchange of ions and then form two new compound
Reaction in which compounds exchanges their ions.
double displacement reaction is the reaction in which there is a mutual exchange of ions .example:- NaSO4+BaCl2→ 2NaCl2+BaSO4 (precipitate)
Reaction in which exchange of ions take place

The chemical reaction in which two compounds exchange their ions to form new compounds is called double displacement reaction.
when two elements displaces each other in a chemical reaction it is called double displacement reaction
AB+CD—— AD+BC
When two atoms or molecules displaces the other group or molecule.then this reaction is said to bo be double displacement reaction..