Gas Chromatography
Which of the following detectors give concentration-dependent signals?

All of these
Electron-capture detector
Infra-red detector
Thermal conductivity

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Gas Chromatography
Resolution is proportional to the

cube root of the number of theoretical plates in a column
square root of the number of theoretical plates in a column
number of theoretical plates in a column
square of the number of theoretical plates in a column

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Gas Chromatography
What does the selectivity factor describe?

The relative separation achieved between two species
The proportional difference in widths of two chromatographic peaks
None of these
The maximum number of different species which a column can separate simultaneously

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Gas Chromatography
Sample injection is considered successful if

the sample is spread evenly along the column
the sample is concentrated at the start of the column
all of the sample in the injector has been added to the column
the sample is homogenously spread along the column

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