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MCQs

Total Questions : 57 | Page 5 of 6 pages
Question 41. . What does the retention factor, k', describe?
  1.    The distribution of an analyte between the stationary and the mobile phase
  2.    The migration rate of an analyte through a column
  3.    The velocity of the mobile phase
  4.    All of these
 Discuss Question
Answer: Option B. -> The migration rate of an analyte through a column
Question 42. . Theoretical plates are used to
  1.    estimate the efficiency of a column
  2.    determine the thickness of the stationary phase
  3.    measure the distribution of the analyte between mobile and stationary phases
  4.    None of the above
 Discuss Question
Answer: Option A. -> estimate the efficiency of a column
Question 43. . What does the selectivity factor describe?
  1.    The proportional difference in widths of two chromatographic peaks
  2.    The maximum number of different species which a column can separate simultaneously
  3.    The relative separation achieved between two species
  4.    None of the above
 Discuss Question
Answer: Option C. -> The relative separation achieved between two species
Question 44. . Helium is generally preferred as carrier gas over nitrogen and hydrogen because
  1.    it is inert
  2.    it has a lower viscosity
  3.    it doubles up as a party gas for balloons and funny voices
  4.    all of above
 Discuss Question
Answer: Option D. -> all of above
Question 45. . The column is heated to
  1.    prevent analyte condensation within the column
  2.    control elution of the different analytes
  3.    reduce band broadening to get sharper peaks
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 46. . Sample retention in the column is measured by
  1.    retention time
  2.    retention factor
  3.    retention index
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 47. . What are the benefits of decreasing the column internal diameter?
  1.    Increased sample capacity
  2.    Increased resolution
  3.    Reduced risk of column overloading
  4.    All of the above
 Discuss Question
Answer: Option B. -> Increased resolution
Question 48. . Column bleeding occurs when
  1.    elution of the analyte is extended over time
  2.    the column is cracked and stationary phase leaks out
  3.    traces of the stationary phase are eluted
  4.    the column breaks during installation and causes personal injury
 Discuss Question
Answer: Option C. -> traces of the stationary phase are eluted
Question 49. . Sample injection is considered successful if
  1.    all of the sample in the injector has been added to the column
  2.    the sample is concentrated at the start of the column
  3.    the sample is spread evenly along the column
  4.    the sample is homogenously spread along the column
 Discuss Question
Answer: Option B. -> the sample is concentrated at the start of the column
Question 50. . Which of the following are not used as stationary phases in a GC column?
  1.    Polysiloxanes
  2.    Silica
  3.    Cyclodextrins
  4.    None are used as stationary phases
 Discuss Question
Answer: Option B. -> Silica

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