A displacement reaction is one in which one element of a compound is replaced by another element. For example, when a strip of Zn is placed is aqueous CuSO4 (blue), it does not take long for the displacement reaction to form metallic copper and colourless ZnSO4 solution. In double displacement reactions, two reacting compounds exchange their corresponding ions and form two new compounds. For example, double displacement reaction takes place when aqueous solutions of barium chloride and sodium sulphate are mixed together; barium sulphate and sodium chloride are formed

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