It's displacment reaction.

Displacement Reaction of Metals
Metal displacement reactions occur when a more reactive metal displaces a less reactive metal from its salt solution. This reaction demonstrates the reactivity series of metals, with more reactive metals displacing less reactive metals from their compounds.

Explanation:
- When a more reactive metal is added to the salt solution of a less reactive metal, the more reactive metal will displace the less reactive metal from the solution.
- This is because the more reactive metal has a higher tendency to lose electrons and form positive ions, which allows it to replace the less reactive metal in the compound.
- The displacement reaction results in the formation of a new compound with the more reactive metal and the salt of the less reactive metal.
- For example, if zinc is added to a solution of copper sulfate, the zinc will displace copper from the solution, forming zinc sulfate and copper metal.

Significance:
- Metal displacement reactions are important in understanding the reactivity series of metals.
- They are also used in various industries for processes such as metal extraction and purification.
- These reactions help in identifying the relative reactivity of different metals and their potential applications in different chemical processes.
In conclusion, metal displacement reactions involving a more reactive metal displacing a less reactive metal from its salt solution illustrate the reactivity series of metals and have significant applications in various industries.