Multiple choice general knowledge science & technology Potassium iodide NaCl NaOH AgCl KI Reveal answer Fill a bubble to check yourself D Correct answer Explanation Potassium iodide has the chemical formula KI, formed from potassium (K) and iodine (I). It's used in iodized salt and radiation protection. NaCl is sodium chloride, NaOH is sodium hydroxide, and AgCl is silver chloride.