Gas Chromatography
Theoretical plates are used to

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

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Gas Chromatography
In column switching chromatography

one column is removed and replaced by another
any of the above
the flow to the column is switched on and off repeatedly
compounds trapped on one column are eluted to another column

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