Question

what is observed when a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube

Answer 1

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When potassium iodide solution is added to a solution of lead nitrate, then a yellow precipitate of lead iodide is formed. Thus, the chemical reaction between potassium iodide and lead nitrate is characterised by the formation of a yellow precipitate of lead iodide................

Answer 2

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The lead nitrate solution contains particles (ions) of lead, and the potassium iodide solution contains particles of iodide.
When the solutions mix, the lead particles and iodide particles combine and create two new compounds, a yellow solid called lead iodide and a white solid called potassium nitrate.

2Kl+Pb(NO3)2--------> 2KNO3+Pbl2