Question

Explain double displacement reaction

Answer 1

Exchange of two or more elements in a single reaction is called double displacement reaction.

BaCl2 + Na2SO4 ==> BaSO4 + 2NaCl

Hope this will help you!!!

Answer 2

Each reaction has reactant which reacts to form compounds called products. Anion and cation of compounds change their placement to react and form altogether different compounds. 
The standard representation is 
XY + AB ------ XB +AY 
This reaction in form ions 
X+Y- + A+ B- --------  X+B-  +   A+Y-



Examples are -- 
AgNO3 + NaCl ------ NaNO3 + AgCl  
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