Gas Chromatography
Derivatisation of a sample is carried out to

reduce polarity of the analytes
increase volatility of the analytes
All of these
increase the detector response

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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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Gas Chromatography
Sample injection is considered successful if

the sample is spread evenly 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 homogenously spread along the column

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Gas Chromatography
Column bleeding occurs when

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

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