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  • Question
  • What is the typical internal diameter of fused silica capillary columns?


  • Options
  • A. 0.2-0.3 mm
  • B. 0.3-0.5mm
  • C. 0.5-1.0 mm
  • D. 1.0-2.0 mm

  • Correct Answer
  • 0.2-0.3 mm 


  • Gas Chromatography problems


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    • 1. Theoretical plates are used to

    • Options
    • A. estimate the efficiency of a column
    • B. determine the thickness of the stationary phase
    • C. measure the distribution of the analyte between mobile and stationary phases
    • D. None of the above
    • Discuss
    • 2. Headspace analysis is carried out in order to

    • Options
    • A. analyse volatile compounds from solid or liquid samples
    • B. determine the psychological state of the tutor
    • C. analyse the column contents ahead of the sample
    • D. determine non-volatiles
    • Discuss
    • 3. Which of the following detectors give concentration-dependent signals?

    • Options
    • A. Electron-capture detector
    • B. Thermal conductivity
    • C. Infra-red detector
    • D. All of these
    • Discuss
    • 4. Which of the following are not used as stationary phases in a GC column?

    • Options
    • A. Polysiloxanes
    • B. Silica
    • C. Cyclodextrins
    • D. None are used as stationary phases
    • Discuss
    • 5. Which of the following gases is unsuitable for use as a GC carrier gas?

    • Options
    • A. Nitrogen
    • B. Helium
    • C. Oxygen
    • D. All of the above
    • Discuss
    • 6. A retention gap is placed between the injector and the front of the column to

    • Options
    • A. retain contaminants and prevent them from reaching the column
    • B. retain the sample and release it gradually to the column
    • C. prevent backflush of the injected solution
    • D. all of the above
    • Discuss
    • 7. Split injection is carried out by

    • Options
    • A. splitting the sample into smaller portions to inject sequentially
    • B. splitting the sample into smaller portions to inject at the same time through parallel ports
    • C. splitting off some of the sample so that it does not enter the column
    • D. none of the above
    • Discuss
    • 8. What useful information can be found from a Van Deemter plot?

    • Options
    • A. The selectivity factor
    • B. Optimum mobile phase flow rate
    • C. Optimum column temperature
    • D. Optimum column length
    • Discuss
    • 9. The GC trace obtained after an experiment is called a

    • Options
    • A. chromatograph
    • B. chromatogram
    • C. chromatophore
    • D. graph
    • Discuss
    • 10. Which of the statements is correct?

    • Options
    • A. Gas chromatography is used to analyse gases
    • B. Gas chromatography is used to analyse solids
    • C. Gas chromatography is used to analyse gases, solutions and solids
    • D. All of the above
    • Discuss


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