18 Select the FALSE statement about the molar absorptivity coefficient (e). A. h

Question

18 Select the FALSE statement about the molar absorptivity coefficient (e). A. has higher magnitude for transitions from m electrons than from non bonding electrons B. it can be found from the slope of the linear part of the calibration curve (defined by the Lambert Beer law) for a specific compound C. it can be affected by the solvent used to dissolve the study compounds D. It is not affected by the wavelength used to irradiate the sample (1 mark) 19. Which of the following factors will never affect the intensity of the absorption from a chromophore group in UV-Vis spectroscopy A. the height (the longest dimension) of the cuvette B. the pH C. the number of molecules containing the chromophore exposed to the radiation D. the population of the electronic states (1 mark) 20 Select the TRUE statement about infrared spectroscopy. A. electronic transitions are the origin of the absorption bands observed in the IR spectra B. more than one absorption band may result when radiating an analyte, C. the absorption spectra is independent from the structure of the analyte, D. hydrogen bonding never affects the spectra of a molecule (1 mark) 21. Which of the following compounds will NOT absorb infrared radiation? A. carbon dioxide B. acetone C. chlorine D. chloroform (1 mark) 22. In gas chro spectrometry, the signal obtained can only be matography-mass from which ONE of the following? A. charged species B. molecules with a chromophore group C. molecules which have a change in dipole moment during a vibration D. molecules that do not interact with magnetic field (1 mark)

Explanation / Answer

18. A. has higher magnitude for transitions from electrons than from non-bonding electrons.

19. A. the height (the longest dimension) of the cuvette.

20. C. the absorption spectra is independent from the structure of the analyte.

21. C. Chlorine

Chlorine can not absorb infrared radiation because its bond is non-polar.

22. A. Charged species

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