Exercise: Gas Chromatography

Questions for: Gas Chromatography

Which of the following gases is unsuitable for use as a GC carrier gas?
A:
Nitrogen
B:
Helium
C:
Oxygen
D:
All of the above
Answer: C
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Sample injection is considered successful if
A:
all of the sample in the injector has been added to the column
B:
the sample is concentrated at the start of the column
C:
the sample is spread evenly along the column
D:
the sample is homogenously spread along the column
Answer: B
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Doubling the column's length increases resolution by a factor of
A:
(2)0.5
B:
2
C:
3
D:
4
Answer: A
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Which of the following are not used as stationary phases in a GC column?
A:
Polysiloxanes
B:
Silica
C:
Cyclodextrins
D:
None are used as stationary phases
Answer: B
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Column bleeding occurs when
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
Answer: C
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