Answer :
Single-displacement reaction : It is a type of reaction in which a more reactive metal displace the less reactive metal from the solution.
General equation for single-displacement reaction is,
[tex]A+BC\rightarrow AC+B[/tex]
In this reaction, A displaces B because A is more reactive than B.
These reactions answered on the basis of reactivity series. The reactivity series image is shown below.
The balanced reaction is,
[tex]Zn+CuSO_4\rightarrow ZnSO_4+Cu[/tex]
When zinc react with copper sulfate then zinc displaces the copper from copper sulfate because zinc is more reactive metal than the copper.
The balanced reaction is,
[tex]2Al+3CuSO_4\rightarrow Al_2(SO_4)_3+3Cu[/tex]
When aluminium react with copper sulfate then aluminium displaces the copper from copper sulfate because aluminium is more reactive metal than the copper.
The balanced reaction is,
[tex]Zn+2AgNO_3\rightarrow Zn(NO_3)_2+2Ag[/tex]
When zinc react with silver nitrate then zinc displaces the silver from silver nitrate because zinc is more reactive metal than the silver.
The balanced reaction is,
[tex]Cu+2AgNO_3\rightarrow Cu(NO_3)_2+2Ag[/tex]
When copper react with silver nitrate then copper displaces the silver from silver nitrate because copper is more reactive metal than the silver.