Gas Chromatography
The column is heated to

prevent analyte condensation within the column
control elution of the different analytes
all of these
reduce band broadening to get sharper peaks

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Gas Chromatography
Sample injection is considered successful if

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

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Gas Chromatography
What does the selectivity factor describe?

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

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Gas Chromatography
In column switching chromatography

one column is removed and replaced by another
compounds trapped on one column are eluted to another column
any of the above
the flow to the column is switched on and off repeatedly

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