Discussion
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- Question
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
- Correct Answer
- splitting off some of the sample so that it does not enter the column
- 1. 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
- 2. 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 Discuss
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. The GC trace obtained after an experiment is called a
Options- A. chromatograph
- B. chromatogram
- C. chromatophore
- D. graph Discuss
- 8. 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
- 9. What does the retention factor, k', describe?
Options- A. The distribution of an analyte between the stationary and the mobile phase
- B. The migration rate of an analyte through a column
- C. The velocity of the mobile phase
- D. All of these Discuss
- 10. Sample retention in the column is measured by
Options- A. retention time
- B. retention factor
- C. retention index
- D. all of these Discuss
Gas Chromatography problems
Search Results
Correct Answer: retain contaminants and prevent them from reaching the column
Correct Answer: 0.2-0.3 mm
Correct Answer: estimate the efficiency of a column
Correct Answer: analyse volatile compounds from solid or liquid samples
Correct Answer: All of these
Correct Answer: Optimum mobile phase flow rate
Correct Answer: chromatogram
Correct Answer: All of the above
Correct Answer: The migration rate of an analyte through a column
Correct Answer: all of these
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