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- Question
In column switching chromatography
Options- A. compounds trapped on one column are eluted to another column
- B. one column is removed and replaced by another
- C. the flow to the column is switched on and off repeatedly
- D. any of the above
- Correct Answer
- compounds trapped on one column are eluted to another column
- 1. Derivatisation of a sample is carried out to
Options- A. reduce polarity of the analytes
- B. increase the detector response
- C. increase volatility of the analytes
- D. all of the above Discuss
- 2. What are the benefits of decreasing the column internal diameter?
Options- A. Increased sample capacity
- B. Increased resolution
- C. Reduced risk of column overloading
- D. All of the above Discuss
- 3. Sample injection is considered successful if
Options- A. all of the sample in the injector has been added to the column
- B. the sample is concentrated at the start of the column
- C. the sample is spread evenly along the column
- D. the sample is homogenously spread along the column Discuss
- 4. Sample retention in the column is measured by
Options- A. retention time
- B. retention factor
- C. retention index
- D. all of these Discuss
- 5. 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
- 6. Resolution is proportional to the
Options- A. number of theoretical plates in a column
- B. square root of the number of theoretical plates in a column
- C. square of the number of theoretical plates in a column
- D. cube root of the number of theoretical plates in a column Discuss
- 7. The column is heated to
Options- A. prevent analyte condensation within the column
- B. control elution of the different analytes
- C. reduce band broadening to get sharper peaks
- D. all of these Discuss
- 8. Which of the following detectors give mass flow-dependent signals?
Options- A. Electron capture detector
- B. Field ionisation detector
- C. Thermal conductivity detector
- D. All of the above Discuss
- 9. Which of the following is not used for detection in GC?
Options- A. Infrared spectroscopy
- B. NMR
- C. Flame ionisation
- D. Electrical conductivity Discuss
- 10. Which of these effects result from slow injection of a large sample volume?
Options- A. Increased resolution
- B. Decreased resolution
- C. Non-linear detector response
- D. Constant resolution Discuss
Gas Chromatography problems
Search Results
Correct Answer: all of the above
Correct Answer: Increased resolution
Correct Answer: the sample is concentrated at the start of the column
Correct Answer: all of these
Correct Answer: The migration rate of an analyte through a column
Correct Answer: square root of the number of theoretical plates in a column
Correct Answer: all of these
Correct Answer: Field ionisation detector
Correct Answer: NMR
Correct Answer: Decreased resolution
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