An Iodide Test is a laboratory procedure used to detect iodide ions in inorganic salts such as potassium iodide through physical observations and confirmatory chemical reactions. It involves identifying solubility, color changes, and reactions with reagents like sulfuric acid, silver nitrate, lead acetate, mercuric chloride, and copper sulfate. These reactions produce characteristic precipitates or iodine vapors, confirming the presence of iodide radicals and helping distinguish them from other halide ions.