Answer:

Explanation: A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
The reaction between acid and a base is a double displacement reaction called as neutralization and forms salt and water.
The balanced chemical reaction between sodium hydroxide and sulfuric acid:
