Gas Chromatography
What does the selectivity factor describe?

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

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Gas Chromatography
Split injection is carried out by

splitting off some of the sample so that it does not enter the column
splitting the sample into smaller portions to inject sequentially
None of these
splitting the sample into smaller portions to inject at the same time through parallel ports

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Gas Chromatography
In column switching chromatography

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
one column is removed and replaced by another

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