(a) What is the difference between displacement and double displacement reactions? Write equations for these reactions.
(b) What do you mean by a precipitation reaction? Explain giving an example.

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Solution

(a)

Displacement Reaction Double Displacement Reaction

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. Double displacement reaction is a chemical reaction in which exchange of ions between both the reactants takes place.

Example:
Zn + CuSO₄→ ZnSO₄ + Cu
Here, Zinc (Zn), which is more reactive than Cu, displaces copper from its solution. Example:
Na₂SO₄+ BaCl₂→ BaSO₄ + 2NaCl
Here, both Na₂SO₄ and BaCl₂ exchange their ions.

(b) Precipitation reaction: It is a chemical reaction in which an insoluble solid (precipitate) is formed that is separate from the solution.

Example: Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl
Here, white precipitate of barium sulphate is formed.

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Displacement Reaction	Double Displacement Reaction
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.	Double displacement reaction is a chemical reaction in which exchange of ions between both the reactants takes place.
Example: Zn + CuSO₄→ ZnSO₄ + Cu Here, Zinc (Zn), which is more reactive than Cu, displaces copper from its solution.	Example: Na₂SO₄+ BaCl₂→ BaSO₄ + 2NaCl Here, both Na₂SO₄ and BaCl₂ exchange their ions.

(a) What is the difference between displacement and double displacement reactions? Write equations for these reactions. (b) What do you mean by a precipitation reaction? Explain giving an example.

(a) What is the difference between displacement and double displacement reactions? Write equations for these reactions.
(b) What do you mean by a precipitation reaction? Explain giving an example.