Discussion
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- Question
Which of the following is not used for detection in GC?
Options- A. Infrared spectroscopy
- B. NMR
- C. Flame ionisation
- D. Electrical conductivity
- Correct Answer
- NMR
- 1. 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
- 2. 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
- 3. 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
- 4. 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 Discuss
- 5. 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
- 6. 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
- 7. Column bleeding occurs when
Options- A. elution of the analyte is extended over time
- B. the column is cracked and stationary phase leaks out
- C. traces of the stationary phase are eluted
- D. the column breaks during installation and causes personal injury Discuss
- 8. What does the selectivity factor describe?
Options- A. The proportional difference in widths of two chromatographic peaks
- B. The maximum number of different species which a column can separate simultaneously
- C. The relative separation achieved between two species
- D. None of the above Discuss
- 9. Helium is generally preferred as carrier gas over nitrogen and hydrogen because
Options- A. it is inert
- B. it has a lower viscosity
- C. it doubles up as a party gas for balloons and funny voices
- D. all of above Discuss
- 10. Doubling the column's length increases resolution by a factor of
Options- A. (2)0.5
- B. 2
- C. 3
- D. 4 Discuss
Gas Chromatography problems
Search Results
Correct Answer: Field ionisation detector
Correct Answer: all of these
Correct Answer: square root of the number of theoretical plates in a column
Correct Answer: compounds trapped on one column are eluted to another column
Correct Answer: all of the above
Correct Answer: Decreased resolution
Correct Answer: traces of the stationary phase are eluted
Correct Answer: The relative separation achieved between two species
Correct Answer: all of above
Correct Answer: (2)0.5
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