Gas Chromatography – Section 1

6. What is the typical internal diameter of fused silica capillary columns?

A. 0.2-0.3 mm
B. 0.3-0.5mm
C. 0.5-1.0 mm
D. 1.0-2.0 mm

Correct Answer: A. 0.2-0.3 mm

7. Resolution is proportional to the

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

Correct Answer: B. square root of the number of theoretical plates in a column

8. Derivatisation of a sample is carried out to

A. reduce the polarity of the analytes
B. increase the detector response
C. increase volatility of the analytes
D. all of the above

Correct Answer: D. all of the above

9. Which of the statements is correct?

A. Gas chromatography is used to analyze gases
B. Gas chromatography is used to analyze solids
C. Gas chromatography is used to analyze gases, solutions and solids
D. All of the above

Correct Answer: D. All of the above

10. In column switching chromatography

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: A. compounds trapped on one column are eluted to another column

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