What is meant by (a) displacement reaction, and (b) double displacement reaction? Explain with help of one example each.

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Solution

(a) Displacement reaction is a chemical reaction in which displacement of a metal from its solution takes place by the other metal that is more reactive than the metal being displaced.

Example:
Zn + CuSO₄ → ZnSO₄ + Cu

Here, Zn, being more reactive than Cu, displaces copper from its solution.

(b)Double displacement reaction is a chemical reaction in which both the reactants exchange their ions to form two new compounds.

Example:
Na₂SO₄+ BaCl₂→ BaSO₄+ 2NaCl

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