Gas Chromatography
Theoretical plates are used to

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

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Gas Chromatography
Sample injection is considered successful if

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

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Gas Chromatography
Split injection is carried out by

None of these
splitting off some of the sample so that it does not enter the column
splitting the sample into smaller portions to inject sequentially
splitting the sample into smaller portions to inject at the same time through parallel ports

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