The correct full form of NMR is Nuclear Magnetic Resonance.

Here's a breakdown of the different options:

• Nucleus Magnetic Resonance: This is the accurate and widely accepted full form of NMR.
• Nuclear Measring Resonance: This is not a commonly used or accurate full form.
• Nuclear Molecular Resonance: This is also not an accurate full form. While NMR uses molecules containing nuclei, the focus is on the magnetic resonance of the nuclei themselves.

NMR spectroscopy is a technique used to study the properties of molecules by observing the magnetic resonance of their atomic nuclei. When placed in a strong magnetic field, certain nuclei will absorb and emit radiofrequency radiation. The frequency of this radiation depends on the chemical environment of the nucleus. By analyzing the frequencies of the absorbed or emitted radiation, scientists can gain information about the structure and dynamics of the molecule.

NMR is a powerful tool used in various fields, including chemistry, biology, physics, and medicine. It has applications in drug discovery, materials science, and medical imaging, among others.