Gas Chromatography problems
- 1. Which of the following is not used for detection in GC?
Options- A. Infrared spectroscopy
- B. NMR
- C. Flame ionisation
- D. Electrical conductivity Discuss
Correct Answer: NMR
- 2. 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
Correct Answer: Decreased resolution
- 3. 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
Correct Answer: traces of the stationary phase are eluted
- 4. 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
Correct Answer: The relative separation achieved between two species
- 5. 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
Correct Answer: all of above
- 6. Doubling the column's length increases resolution by a factor of
Options- A. (2)0.5
- B. 2
- C. 3
- D. 4 Discuss
Correct Answer: (2)0.5
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