Multiple Choice Questions and Answers on NMR Spectroscopy
Question 1 : All hydrogen atoms
- have the same resonance frequency
- resonate at different frequencies depending on their environment
- are attached to carbon
- resonate at about the same frequency as carbon
Answer : 2
Question 2 : Why is it important to use a deuterated solvent?
- NMR uses least of this solvent
- So the spectrometer can lock onto the sample to prevent the spectrum from drifting during aquisition
- Expensive solvents work best with NMR
- They dissolve polymer the fastest
Answer : 2
Question 3 : What is shielding in NMR?
- Using a curved piece of metal to block an opponents attack
- Putting metal around an Rf source
- When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei
- Blocking parts of a molecule from Rf radiation
Answer : 3
Question 4 : What is used to cool the superconducting coil?
- Hydrogen
- Ice
- Dry ice
- Liquid helium
Answer : 4
Question 5 : Coupling causes the peaks in 1H NMR spectra to be split into
- two peaks
- multiple peaks equal to the number of hydrogens on surrounding atoms
- multiple peaks equal to the number of surrounding carbon atoms
- multiple peaks equal to the number of hydrogen on surrounding atoms, plus one
Answer : 4
Question 6 : When placed in a magnetic field, all the random spins of the nuclei
- stop
- reverse direction
- align with the magnetic field
- rotate to 90° away from the induced field
Answer : 3
Question 7 : Better understanding of the nuclei is possible,
- with the help of wavelength spectrum
- with the help of frequencies ranges
- with the help of a mathematical translator called the fourier transfer algorithm
- none of the above
Answer : 3