Reaction in which any insoluble solid precipitate is formed is called Precipitation Reaction
When Sodium Sulphate solution is mixed with Barium Chloride solution It forms Barium Sulphate and Sodium Chloride solution.
In this reaction, a white precipitate of Barium Sulphate is formed .
When Potassium Iodide solution is added to Lead Nitrate solution
A yellow precipitate of Lead Iodide is formed along with Potassium Nitrate solution
Intext Question - Page 13 Q2
NCERT Exercise - Q15