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?
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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