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MCQs

Total Questions : 18 | Page 2 of 2 pages
Question 11. . Vibrational spectroscopy is
  1.    a large mass on a weak spring
  2.    a flashlight through a prism and shake it
  3.    a class of spectroscopic techniques which analyzes molecular motions
  4.    an Infrared spectroscopy
 Discuss Question
Answer: Option C. -> a class of spectroscopic techniques which analyzes molecular motions
Question 12. . UV-Vis spectroscopy of organic compounds is usually concerned with which electronic transition(s)?
  1.    σ → σ*
  2.    n → σ*
  3.    n → π* and π → π*
  4.    none of these
 Discuss Question
Answer: Option C. -> n → π* and π → π*
Question 13. . Which of the following components of a monochromator is the dispersing element?
  1.    The collimating lens
  2.    The entrance slit
  3.    The diffraction grating
  4.    None of these
 Discuss Question
Answer: Option C. -> The diffraction grating
Question 14. . A simple harmonic oscillator may absorb energy
  1.    at anytime.
  2.    when the frequencies match exactly
  3.    when the amplitudes are the same.
  4.    at no time.
 Discuss Question
Answer: Option B. -> when the frequencies match exactly
Question 15. . Why are rotational transitions of little use to a spectroscopist?
  1.    Because the energy required to induce a rotational transition is so small that it cannot be measured
  2.    Because rotational transitions are extremely rare
  3.    Because, in liquids and solids, spectral lines corresponding to rotational transitions are broadened as the result of molecular collisions and other interactions
  4.    All of the above
 Discuss Question
Answer: Option C. -> Because, in liquids and solids, spectral lines corresponding to rotational transitions are broadened as the result of molecular collisions and other interactions
Question 16. . Beer's Law states that
  1.    absorbance is proportional to both the path length and concentration of the absorbing species
  2.    absorbance is proportional to the log of the concentration of the absorbing species
  3.    absorbance is equal to P0 / P
  4.    none of the above
 Discuss Question
Answer: Option A. -> absorbance is proportional to both the path length and concentration of the absorbing species
Question 17. . Why are rotational transitions of little use to a spectroscopist?
  1.    Because the energy required to induce a rotational transition is so small that it cannot be measured
  2.    Because rotational transitions are extremely rare
  3.    Because, in liquids and solids, spectral lines corresponding to rotational transitions are broadened as the result of molecular collisions and other interactions
  4.    All of the above
 Discuss Question
Answer: Option C. -> Because, in liquids and solids, spectral lines corresponding to rotational transitions are broadened as the result of molecular collisions and other interactions
Question 18. . Beer's Law states that
  1.    absorbance is proportional to both the path length and concentration of the absorbing species
  2.    absorbance is proportional to the log of the concentration of the absorbing species
  3.    absorbance is equal to P0 / P
  4.    none of the above
 Discuss Question
Answer: Option A. -> absorbance is proportional to both the path length and concentration of the absorbing species

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