Gas Chromatography
Column bleeding occurs when

the column is cracked and stationary phase leaks out
elution of the analyte is extended over time
the column breaks during installation and causes personal injury
traces of the stationary phase are eluted

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Gas Chromatography
What does the selectivity factor describe?

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

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Gas Chromatography
Theoretical plates are used to

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

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