Gas Chromatography
Column bleeding occurs when

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

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Gas Chromatography
Theoretical plates are used to

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

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Gas Chromatography
Sample injection is considered successful if

all of the sample in the injector has been added to the column
the sample is concentrated at the start of the column
the sample is spread evenly along the column
the sample is homogenously spread along the column

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