Which of the Following Statements Is TRUE

question 23

Multiple Choice

Which of the following statements is TRUE?

• A) A common reference compound for ¹H and ¹³C NMR is tetramethylsilane.
• B) Nuclear magnetic resonance spectroscopy uses the fact that some atomic nuclei, such as ¹H and ¹³C, have two nuclear spin states with different energies when exposed to a high potential difference.
• C) The energy difference between two nuclear spin states corresponds to the energy of photons in the microwave part of the electromagnetic spectrum.
• D) The energy difference between two nuclear spin states depends on the number of protons and neutrons in the atomic nucleus.
• E) The difference in absorption frequency of a nucleus outside the magnetic field and a nucleus inside the external magnetic field is called the chemical shift.

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