Gas Chromatography
Column bleeding occurs when

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

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Gas Chromatography
Theoretical plates are used to

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

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