Answer:
Double displacement reaction
Step-by-step explanation:
The reaction shown is a double displacement or double decomposition reaction. It is also called a metathesis. 
- In a double displacement reaction, there is an actual exchange of partners. 
- One the partners are exchanged new products are formed. 
- The reaction is driven by the formation of a precipitate. 
- Also, some times water or non-ionizing compound forms. 
- There is also a liberation of gaseous products.