Multiple choice general knowledge science & technology KF Potassium Chloride Potassium Fluoride Kryptic Acid Kryptic Flouride Reveal answer Fill a bubble to check yourself B Correct answer Explanation KF is the chemical formula for Potassium Fluoride, where K is the symbol for Potassium (from its Latin name Kalium) and F is the symbol for Fluorine. Potassium Chloride would be KCl, and 'Kryptic' options are invented nonsense.