Multiple choice Which of the following is one of the constituents of gunpowder? Potassium hydroxide Potassium iodide Potassium peroxymonosulfate Potassium nitrate Reveal answer Fill a bubble to check yourself D Correct answer Explanation Potassium nitrate occurs as a mineral niter and is a natural solid source of nitrogen. Major uses of potassium nitrate are in fertilizers, rocket propellants and fireworks. It is one of the constituents of gunpowder.