Displacement Reaction


 
 
Concept Explanation
 

Displacement Reaction

Displacement Reaction:

When an element displace another element from its compound, it is called displacement reaction.

This reaction is of two types:

(i) Single Displacement Reaction 

It is a type of chemical reaction where an element reacts with a compound and takes the place of another element in that compound is called single displacement.

(a) Zinc being more reactive than Cu, displaces Cu from large CuSO_{4} solution and forms new product, zinc sulphate and Cu metal.

Zn(s)+CuSO_{4}(aq)rightarrow ZnSO_{4}(aq)+Cu(s)

Zinc metal      Copper sulphate             Zinc sulphate solution    Copper metal

(Grey)             solution (Blue)                (Colourless)                  (Brown)

(b) Similarly, iron displaces copper from aqueous solution of copper sulphate.

Fe(s)+CuSO_{4}(aq)rightarrow FeSO_{4}(aq)+Cu(s)

Iron metal    Copper sulphate              Ferrous sulphate        Copper metal

                    (Blue)                                  or

                                                       Iron (II) sulphate

                                                        (Green)

(ii) Double Displacement Reaction 

The reaction in which two different ions or group of atoms in the reactant molecules are displaced by each other, is called double displacement reaction.

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Sample Questions
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Question : 1

Which of the following is an example of double displacement reaction?

Right Option : C
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Question : 2

Which of the following are correct :

(a) When an element displaces another element from its compound, it is called displacement reaction.

(b) Zinc being more reactive than Cu, displaces Cu from large CuSO_{4} solution and forms new product, zinc sulphate and Cu metal.

(c) The reaction in which two different ions or group of atoms in the reactant molecules are displaced by each other, is called double displacement reaction.

Right Option : D
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Question : 3

Which of the following are correct ?

(a) When an element displace another element from its compound, it is called displacement reaction.

(b) Chemical reaction where an element reacts with a compound and takes the place of another element in that compound is called double displacement.

 

Right Option : A
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