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Gas Chromatography MCQ questions can help students evaluate their knowledge of concepts in Gas chromatography. Answers for gas chromatography MCQ are also given to help you remember. Try our Gas Chromatography MCQ questions to see if you can get all the answers right for the questions below.
Gas Chromatography MCQ Questions
The mobile phase in gas chromatography is a gas, and the components are separated as vapours, which distinguishes it from other types of chromatography.
1. Which of the following is not a detection method in Gas Chromatography?
- Infrared spectroscopy
- NMR
- Flame ionisation
- Electrical conductivity
2. Sample injection is considered successful if
- The entire sample in the injector has been added to the column
- The sample is concentrated at the start of the column
- The sample is spread evenly along the column
- The sample is homogenously spread along the column
3. Which gas should not be used as a carrier gas in a Gas chromatography?
- Nitrogen
- Helium
- Oxygen
- All of the above
4. What does the selectivity factor describe?
- The proportional difference in widths of two chromatographic peaks
- The maximum number of different species which a column can separate simultaneously
- The relative separation achieved between two species
- None of the above
5. Theoretical plates are used to
- Estimate the efficiency of a column
- Determine the thickness of the stationary phase
- Measure the distribution of the analyte between mobile and stationary phases
- None of the above
6. Split injection is carried out by
- Splitting the sample into smaller portions to inject sequentially
- Splitting the sample into smaller portions to inject at the same time through parallel ports
- Splitting off some of the sample so that it does not enter the column
- None of the above
7. Which of the detectors below produces mass flow-dependent signals?
- Electron capture detector
- Field ionisation detector
- Thermal conductivity detector
- All of the above
8. A retention gap is placed between the injector and the front of the column to
- Retain contaminants and prevent them from reaching the column
- Retain the sample and release it gradually to the column
- Prevent back flush of the injected solution
- All of the above
9. Which of the statements is correct?
- Gas chromatography is used to analyse gases
- Gas chromatography is used to analyse solids
- Gas chromatography is used to analyse gases, solutions and solids
- All of the above
10. Derivatisation is the process of converting one sample into another.
- Reduce polarity of the analytes
- Increase the detector response
- Increase volatility of the analytes
- All of the above
11. In column switching chromatography
- Compounds trapped on one column are eluted to another column
- One column is removed and replaced by another
- The flow to the column is switched on and off repeatedly
- Any of the above
12. Resolution is proportional to the?
- Number of theoretical plates in a column
- Square root of the number of theoretical plates in a column
- Square of the number of theoretical plates in a column
- Cube root of the number of theoretical plates in a column
13. How big is the average internal diameter of fused silica capillary columns?
- 0.2-0.3 mm
- 0.3-0.5mm
- 0.5-1.0 mm
- 1.0-2.0 mm
14. What information can be obtained from a Van Deemter plot?
- The selectivity factor
- Optimum mobile phase flow rate
- Optimum column temperature
- Optimum column length
15. Which of the following detectors produces concentration-dependent results?
- Electron-capture detector
- Thermal conductivity
- Infra-red detector
- All of these
Answer Key
1. NMR
2. The sample is concentrated at the start of the column
3. Oxygen
4. The relative separation achieved between two species
5. Estimate the efficiency of a column
6. Splitting off some of the sample so that it does not enter the column
7. Field ionisation detector
8. Retain contaminants and prevent them from reaching the column
9. All of the above
10. All of the above
11. Compounds trapped on one column are eluted to another column
12. Square root of the number of theoretical plates in a column
13. 0.2-0.3 mm
14. Optimum mobile phase flow rate
15. All of these
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