What is the difference between displacement and double displacement reactions

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What is the difference between displacement and double displacement reactions? Write equations for these reactions.

Answer: When a more reactive element displaces a less reactive element from its salt solution, then it is called displacement reaction. While there is an exchange of ions between the reactants to produce new substances, it is called double displacement reaction.
In displacement reaction one displacement takes place. While in double displacement reaction two displacements takes place. Following are examples of displacement reaction and double displacement reaction.
Mg (s) + 2HCl (aq) ⇨ MgCl2 + H2 (g)
2KBr (aq) + BaCl2 ⇨ 2KCl (aq) + BaBr2 (s)

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