Nmr Spectroscopy

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

Answer: B

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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

Answer: B

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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

Answer: C

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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

Answer: C

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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

Answer: D

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Questions for: Nmr Spectroscopy