Multiple choice general knowledge science & technology Potassium hydroxide KCl AgCl KOH NaOH Reveal answer Fill a bubble to check yourself C Correct answer Explanation Potassium hydroxide has the chemical formula KOH, formed from potassium (K), oxygen (O), and hydrogen (H). It's a strong base also known as caustic potash. KCl is potassium chloride, AgCl is silver chloride, and NaOH is sodium hydroxide.