What will happen when iodine solution is added to

potassium chloride.

Potassium iodide + chlorine gas. In this reaction when potassium iodide solution is put into chlorine gas a rapid reaction occurs and black iodine solid is formed along with potassium chloride solution. The chlorine has kicked the iodide out.

The chlorine is more reactive than the iodine in potassium iodide. This causes the iodine to be displaced from the compound and chloride ions take its place instead.