MCQ Quizzes

Interaction between matter and electromagnetic radiation can be observed by subjecting a substance to two magnetic fields. One magnetic field must be stationary and the other field must be varying at some radio frequency.

In NMR spectroscopy, the spinning nuclei in a strong magnetic field must be irradiated by a weaker field which is perpendicular to it. This permits the identification of atomic configurations in molecules.

Radio waves are considered to be the lowest form of Electromagnetic radiation. NMR uses radio frequency radiation for detection of the structure of substances.

NMR spectrometer provides an accurate and non-destructive method of determining structure in soluble chemical compounds. For a particular nucleus an NMR absorption spectrum may consist of one to several groups of absorption lines.

Nuclei having either the number of protons or neutrons as odd have half-integral spin. Examples are H1 and B11.

When energy is absorbed by the sample, the absorption can be observed as a change in signal developed by a radiofrequency detector. It is then given to an amplifier.

The amount of energy available in radio frequency radiation is sufficient for affecting the nuclear spin of an atom. It constitutes the most fundamental part of spectroscopy.

NMR is the study of absorption of radio frequency radiation by nuclei in a magnetic field. For a particular nucleus, an NMR absorption spectrum may consist of one to several groups of absorption lines.

NMR spectroscopy indicates the chemical nature of the nuclei and spatial positions of neighbouring nuclei. It is one of the most powerful techniques for chemical analysis.

NMR spectroscopy is used for determining structure in liquids. It is also used for determining the structure in soluble chemical compounds.