Question

Q). Define Displacement Reaction ?​

Answer 1

A single-displacement reaction, is a chemical reaction in which one element is replaced by another in a compound. It can be represented generically as: A + B-C → A-C + B This will most often occur if A is more reactive than B, thus giving a more stable product. 

Answer 2

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Those Reaction in which one Element takes the Place of Another Element is a compound

are know as Displacement Reaction.

Example;-

when a piece of magnesium metal react with copper sulphate solution then magnesium sulphate solution and copper metal are formed.