a precipitate is expected when an aqueous solution of potassium iodide is added to an aqueous solution of:

sodium sulfate
iron(II) chloride
calcium perchlorate
barium hydroxide
lead nitrate

3 answers

Look at that list of solubility rules I gave you yesterday. Here it is again in case you misplaced it. http://www.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html
to lead nitrate because it is solube
right answer. wrong reason. Lead iodide is insoluble and that is the precipitate.