What is the net ionic equation for the double replacement reaction between sodium sulphate and barium nitrate?

Hint: There are many types of reactions occurring in nature and in the laboratory, that are classified into various groups. One of them is the double – displacement reaction type. As its name suggests, this reaction consists of the displacement of the two reacting species with each other.

Complete Step By Step Answer:
So, to solve this question first we need to understand the definition of the double replacement reaction. And then on the basis and understanding of the definition we can form out the chemical reaction between the sodium sulphate and barium nitrate.
So, double displacement reaction can be defined as the chemical process involving the exchange of bonds between two reacting chemical species which results in the creation of products with similar or identical bonding affiliations.
Now, we will look into our required equation, so we have to write a double displacement reaction between sodium sulphate and barium nitrate. So, our equation will be:
 $ N{a_2}S{O_4}(aq) + Ba{(N{O_3})_2}(aq) \to BaS{O_4}(s) + 2NaN{O_3}(aq) $
So, when sodium sulphate reacts with barium nitrate, then it results in the formation of Barium sulphate and sodium nitrate. In this reaction, the ions of both the reacting species sodium sulphate and barium nitrate exchange its ions and thus got its name as the double displacement reaction.

Note:
In the given above equation or double displacement reaction the barium sulphate formed as a result of reaction between sodium sulphate and barium nitrate is insoluble in nature and it does not ionise in solution, thus can be detected easily.