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Question

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

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Solution

Displacement reaction: A displacement reaction is a type of chemical reaction in which a more reactive element displaces a less reactive element from its compound or salt solution.
Example: When Zinc(Zn) metal is dipped in the Copper sulphate(CuSO4) solution, Zinc displaces the copper metal from its salt solution and forms Zinc sulphate(ZnSO4) and Copper is deposited at the bottom.

CuSO4(aq)+Zn(s)ZnSO4(aq)+Cu(s)

Double displacement reaction: A double displacement reaction is a type of chemical reaction in which two compounds react by exchanging their ions to form new compounds. It is typically identified by the formation of a product that is a precipitate.
Example: When Sodium sulpahte(Na2SO4) is treated with Barium chloride(BaCl2), it will lead to the formation of Barium sulphate(BaSO4) and Sodium chloride(NaCl).

Na2SO4(aq)+BaCl2(aq)BaSO4(s)+2NaCl(aq)


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