Reaction in which any insoluble solid precipitate is formed is called Precipitation Reaction
Example 1
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 .
Example 2
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