Question

What is the difference between displacement and double displacement reactions? Write equations for these reactions.

Answer 1

Hint:In displacement reaction, one element is substituted for another element. In a double displacement reaction, two ionic compounds are exchanged.

Complete step by step answer:

DISPLACEMENT REACTION	DOUBLE DISPLACEMENT REACTION
1) It is defined as the reaction in which one component displaces another component from its compound is called displacement reaction.	1) The reaction in which two different atoms or groups of atoms (ions) are displaced by other atoms or groups of atoms (ions) is known as a double displacement reaction.
2) The following reaction showing displacement reaction is given below:${ 2HCl(aq)+Zn(s)\rightarrow ZnCl }_{ 2 }{ (aq)+H }_{ 2 }{ (g) }$This is an example of a single displacement reaction. The hydrogen ions in HCl are replaced by zinc atoms and in this process, new element hydrogen is formed.	2) The following reaction showing a double displacement reaction is given below:${ Na }_{ 2 }{ SO }_{ 4 }{ (aq)+BaCl }_{ 2 }{ (aq)\rightarrow BaSO }_{ 4 }{ (s)+2NaCl(aq) }$In this reaction, sulfate ions displace chloride ions and vice versa, or both the ions exchange each other. These reactions occur in ionic compounds. ${ CuCl }_{ 2 }{ (aq)+2AgNO }_{ 3 }{ (aq)\rightarrow Cu(NO }_{ 3 }{ ) }_{ 2 }{ (aq)+2AgCl(s) }$There are two ways of considering a double-displacement reaction, either anion is swapped or cations are swapped.
3) It is a slow reaction.	3) It is a fast reaction.
4) In this reaction, a change of color takes place.	4) In this reaction, precipitate formation takes place.

 Note: The possibility to make a mistake is that in displacement reactions, more active metal displaces less reactive metal whereas in double displacement reaction, the ions are exchanged between the reactants.