Question

2. What is meant by displacement reaction? Explain with an example​

Answer 1

Those reaction in which one element takes the place of another element in compound, are known as displacement reactions.

Example:

CuSO4 (aq) + Zn(s) → ZnSO4 + Cu

Answer 2

Answer:

The type of reaction in which part of one reactant is displaced by another reactant is called displacement reaction. It is also called a  replacement reaction. As replacement of one ion of reactant takes place by another ion of reactant.

OR

A displacement reaction is the one wherein the atom or a set of atoms is displaced by another atom in a molecule

Explanation:

Example – Fe + CuSO4 FeSO4 +Cu

There are two types of displacement reactions –

• Single displacement reaction

Those reactions in which one element replaces another element from its salt or compound are called single displacement reactions.

A + B-C A-C + B   -  (General representation)

Example:- 2K + MgCl2 2KCl + Mg

• Double displacement reaction

Double displacement reactions are those reactions where the cations and anions of reactants switch places with each other or replaces each other.

AB + CD CB + AD  -  (General representation)

Example:- AgNO3 + NaCl AgCl + NaNO3

More examples:-

Single displacement

• Reaction between zinc and copper sulphate -  

    Zn + CuSO4 ZnSO4 + Cu

• Reaction between copper and silver nitrate -                    

   Cu + 2AgNO3 CuNO3 + 2Ag

Double displacement

• Reaction between potassium nitrate and aluminum chloride –

  KNO3 + AlCl3 Al(NO3)3 + KCl

• Reaction between lead nitrate and potassium iodide –

 Pb(NO3)2 + 2KI 2KNO3 + PbI2

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