Gas Chromatography
What does the selectivity factor describe?

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
None of these

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Gas Chromatography
Resolution is proportional to the

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

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