Chemical interaction will be observed when sodium sulfate is added to an aqueous solution 1) Ag 2) NaOH

Chemical interaction will be observed when sodium sulfate is added to an aqueous solution 1) Ag 2) NaOH 3) BaCl2 4) Na2CO3

Answer: 3.
Explanation of the solution to the problem:
1. To find out whether a reaction between silver and sodium sulfate is possible, it is necessary to use the electrochemical range of activity of metals, the metal that enters into a chemical reaction must be stronger than the one in the salt, if this condition is met, then this reaction will proceed. Compared to sodium, silver is located to the right, which means it is weaker, and therefore, it will not be able to displace sodium from its salt, so the reaction will not go.
2. As a result of such an exchange reaction, nothing is formed, because the reaction between an alkali and a salt with a metal of the same name is impossible.
3. After this chemical interaction, as a result of the exchange reaction, a white precipitate of barium sulfate, insoluble in water, is formed:
BaCl2 + Na2SO4 => BaSO4 + 2NaCl.
4. As in case 2, the reaction between two salts with the same metal cation is impossible.