Answer:
The chemical reactions in which
one element takes the place of another element is called
displacement reaction.
For example :
Zinc displaces copper from copper sulphate solution :
Double displacement reactions
are those-in which two compounds react to form two other compounds by mutual
exchange of atoms or group of atoms. For example, in the reaction between
barium chloride and sulphuric acid, barium chloride exchanges its 
s
with 
ions
of 
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