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. What is the advantage of the neutron diffraction method compared to the X-ray diffraction one?

Neutron diffraction can reveal the position of light element's atoms, particularly when in the presence of heavier ones. correct incorrect

X-ray diffraction can reveal the position of light element's atoms, particularly when in the presence of heavier ones. correct incorrect

There is no particular advantage. correct incorrect

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. According to the Beer-Lamber's law, the absorbance of a sample is ____________ to its molar concentration.

inversely proportional correct incorrect

directly proportional correct incorrect

not related correct incorrect

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. To what type of electromagnetic radiation is a sample exposed in Raman spectroscopy?

ultra-violet correct incorrect

visible correct incorrect

infrared correct incorrect

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. Both NMR-spectroscopy and X-ray diffraction have been used for structural analysis. What is the main difference between the information that the two techniques can yield?

Simple one-dimensional NMR analysis of molecules in solutions does not yield details on bond angles and lengths. correct incorrect

X-ray diffraction does not yield details on bond angles and lengths. correct incorrect

Both techniques yield the same results; choosing one or the other is a matter of preference. correct incorrect

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. Which of the listed compounds would be best suited for the EPR analysis?

a metalloenzyme containing Cu correct incorrect

an oxide of an s-block element correct incorrect

sugars correct incorrect

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. Chlorine and bromine have two isotopes each: ³⁵Cl (76), ³⁷Cl (24), ⁷⁹Br (51), and ⁸¹Br (49). What peak (mass-to-charge ratio, m/z) in the MS spectrum of ClBr₃ would correspond to the heaviest molecule?

272 correct incorrect

280 correct incorrect

278 correct incorrect

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. What is mass spectrometry used for?

to detect the masses of molecules and their fragments correct incorrect

to detect the concentration of a molecular analyte in a sample correct incorrect

to detect the structure of a molecule correct incorrect

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. The difference between the main principles of AAS and UV-VIS is:

The absorbing species in AAS are free atoms or ions, while in UV-VIS the absorbing species are molecules; AAS peaks are sharply defined lines because of solely electronic transitions occurring in excited atoms/ions, while UV-VIS peaks are broad bands because of the added rotational and vibrational transitions. correct incorrect

The absorbing species in AAS are molecules, while in UV-VIS the absorbing species are free atoms or ions; AAS peaks are sharply defined lines because of solely electronic transitions occurring in excited atoms/ions, while UV-VIS peaks are broad bands because of the added rotational and vibrational transitions. correct incorrect

The absorbing species in AAS are free atoms or ions, while in UV-VIS the absorbing species are molecules; AAS peaks are broad bands because of solely electronic transitions occurring in excited atoms/ions, while UV-VIS peaks are sharply defined lines because of the added rotational and vibrational transitions. correct incorrect

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. You are given a sample of naphthalene crystals and asked to select an analytical method to determine its mass percent composition. Choose the appropriate method:

X-ray and/or neutron diffraction correct incorrect

CHN analysis correct incorrect

MS correct incorrect

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. Which of the following techniques is not a resonance based technique?

NMR correct incorrect

EPR correct incorrect

Fluorescence correct incorrect