Question

Why solution undergo displacement reactions

Answer 1

When one element is less reactive than other Element then the more reactive element displaces the less reactive element. So that is why the solution goes under displacement reaction.
Example.. Zn + CuSO4= ZnSO4+ Cu

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Answer 2

solutions may undergo displacement reactions when electricity passes from it this process is called electrolysis it is a property of conducting liquids called electrolyte.First found out by William Nicholson and together it is termed as chemical effects of electric current.