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Question

What is the difference between single displacement reaction double displacement reaction?


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Solution

The difference between single displacement and double displacement reaction is as follows,

Single displacement reactionDouble displacement reaction
A displacement reaction is one in which a more active element displace a less active element from its compound.The reaction in which there is an exchange of ions between the reactants is called a double displacement reaction.
The general reaction is, A+B-CA-C+BThe general reaction is, AB+CDAC+CB

Example: Reaction between Zinc granules and Copper sulphate

  • The reaction of zinc granules with copper sulphate (blue colour), reacts to give Zinc sulphate and Copper metal as the product.
  • Zinc is more reactive than copper thereby displacing copper from the copper sulphate solution.

The balenced chemical reaction is as follows,

Zn(s)Zinc+CuSO4(aq)CoppersulphateZnSO4(aq)Zincsulphate+Cu(s)Copper

Example: Reaction between Potassium iodide and Lead nitrate

  • The reaction of potassium iodide with lead nitrate solution gives potassium nitrate and lead iodide as the product.
  • Since the exchange of ions take place between two reactants. So, this is an example of double displacement reaction.

The chemical reaction is as follows,

2KI(aq)Potassiumiodide+Pb(NO3)2(aq)Leadnitrate2KNO3(aq)Potassiumnitrate+PbI2(s)Leadiodide


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