Nuclear Magnetic Resonance (NMR) spectroscopy is one of the best tests for verifying chemical purity because it provides detailed, highly specific information about a compound’s molecular structure. NMR can identify the exact number and environment of atoms in a molecule, allowing for the detection of impurities even at low concentrations. It also gives insights into the chemical environment and bonding patterns, making it easier to confirm whether a sample matches its expected structure. Unlike some other techniques, NMR can assess both the identity and the purity of a compound in one straightforward analysis.