NMR Spectroscopy

Q1: What is shielding in NMR?

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

ANS:C - When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei

No answer description is available.

Q2: What is used to cool the superconducting coil?

A Hydrogen

B Ice

C Dry ice

D Liquid helium

ANS:D - Liquid helium

No answer description is available.

Q3: When placed in a magnetic field, all the random spins of the nuclei

A stop

B reverse direction

C align with the magnetic field

D rotate to 90° away from the induced field

ANS:C - align with the magnetic field

No answer description is available.

Q4: Better understanding of the nuclei is possible,

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

ANS:C - with the help of a mathematical translator called the fourier transfer algorithm

No answer description is available.

Q5: Why is it important to use a deuterated solvent?

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

ANS:B - So the spectrometer can lock onto the sample to prevent the spectrum from drifting during aquisition

No answer description is available.

Q6: All hydrogen atoms

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

ANS:B - resonate at different frequencies depending on their environment.

No answer description is available.

Q7: Coupling causes the peaks in 1H NMR spectra to be split into

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

ANS:D - multiple peaks equal to the number of hydrogen on surrounding atoms, plus one

No answer description is available.



img not found
img

For help Students Orientation
Mcqs Questions

One stop destination for examination, preparation, recruitment, and more. Specially designed online test to solve all your preparation worries. Go wherever you want to and practice whenever you want, using the online test platform.