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Double displacement eg:bacl2+naso4=baso4+nacl2
2 compound interchanges.
displacement eg:mg+hcl=mgcl2+h2
single compound exchange its place

2 3 2
Simple Displacement Reaction is a reaction in which one element displaces another element from its compound

Double Decomposition Reaction  is a reaction in which both the reactants are decomposed to give 2 new compounds by exchanging their radicals

2 3 2