What is observed when potassium iodide solution is added to a solution of lead
nitrate? Name the type of reaction. Write a balanced chemical equation to
represent the above chemical reaction.

when potassium iodide reacts with lead nitrate then it forms potassium nitrate and lead iodide. its chemical equation is

2KI + Pb(NO₃)₂ ----> 2KNO₃ + PbI₂
This reaction is called Double displacement reaction.