Question

when we mix lead 2 nitrate and potassium iodide

Answer 1

when we mix lead2 nitrate and potassium nitare then it gives the presipitate of potassium nitrate and lead iodide.----
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Answer 2

When you mix aqueous solutions of KI and Pb(NO3)2, you get a yellow suspension (precipitate) of lead iodide. Pb(NO3)2(aq) + 2KI(aq) = PbI2(s) + 2KNO3(aq)
PbI2 is insoluble in water and so it is precipitated as a yellow solid (suspension).