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