Gas Chromatography
What useful information can be found from a Van Deemter plot?

Optimum column temperature
Optimum column length
Optimum mobile phase flow rate
The selectivity factor

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Gas Chromatography
What does the selectivity factor describe?

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

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