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MCQs

Total Questions : 57 | Page 2 of 6 pages
Question 11. 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.    All of these
  4.    The velocity of the mobile phase
 Discuss Question
Answer: Option B. -> The migration rate of an analyte through a column
Question 12. A retention gap is placed between the injector and the front of the column to
  1.    All of these
  2.    prevent backflush of the injected solution
  3.    retain contaminants and prevent them from reaching the column
  4.    retain the sample and release it gradually to the column
 Discuss Question
Answer: Option C. -> retain contaminants and prevent them from reaching the column
Question 13. Split injection is carried out by
  1.    None of these
  2.    splitting the sample into smaller portions to inject sequentially
  3.    splitting the sample into smaller portions to inject at the same time through parallel ports
  4.    splitting off some of the sample so that it does not enter the column
 Discuss Question
Answer: Option D. -> splitting off some of the sample so that it does not enter the column
Question 14. Headspace analysis is carried out in order to
  1.    determine the psychological state of the tutor
  2.    analyse the column contents ahead of the sample
  3.    analyse volatile compounds from solid or liquid samples
  4.    determine non-volatiles
 Discuss Question
Answer: Option C. -> analyse volatile compounds from solid or liquid samples
Question 15. Which of the following detectors give mass flow-dependent signals?
  1.    Field ionisation detector
  2.    Thermal conductivity detector
  3.    Electron capture detector
  4.    All of these
 Discuss Question
Answer: Option A. -> Field ionisation detector
Question 16. Theoretical plates are used to
  1.    None of these
  2.    estimate the efficiency of a column
  3.    determine the thickness of the stationary phase
  4.    measure the distribution of the analyte between mobile and stationary phases
 Discuss Question
Answer: Option B. -> estimate the efficiency of a column
Question 17. The column is heated to
  1.    prevent analyte condensation within the column
  2.    reduce band broadening to get sharper peaks
  3.    all of these
  4.    control elution of the different analytes
 Discuss Question
Answer: Option C. -> all of these
Question 18. Helium is generally preferred as carrier gas over nitrogen and hydrogen because
  1.    it doubles up as a party gas for balloons and funny voices
  2.    all of above
  3.    it is inert
  4.    it has a lower viscosity
 Discuss Question
Answer: Option B. -> all of above
Question 19. What does the selectivity factor describe?
  1.    The maximum number of different species which a column can separate simultaneously
  2.    The relative separation achieved between two species
  3.    The proportional difference in widths of two chromatographic peaks
  4.    None of these
 Discuss Question
Answer: Option B. -> The relative separation achieved between two species
Question 20. What are the benefits of decreasing the column internal diameter?
  1.    Increased resolution
  2.    Reduced risk of column overloading
  3.    Increased sample capacity
  4.    All of these
 Discuss Question
Answer: Option A. -> Increased resolution

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