Gas Chromatography
Headspace analysis is carried out in order to

analyse the column contents ahead of the sample
determine non-volatiles
determine the psychological state of the tutor
analyse volatile compounds from solid or liquid samples

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Gas Chromatography
What does the selectivity factor describe?

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

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