Gas Chromatography
Theoretical plates are used to

measure the distribution of the analyte between mobile and stationary phases
None of these
estimate the efficiency of a column
determine the thickness of the stationary phase

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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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