Gas Chromatography
Derivatisation of a sample is carried out to

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

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Gas Chromatography
What does the selectivity factor describe?

The maximum number of different species which a column can separate simultaneously
The proportional difference in widths of two chromatographic peaks
The relative separation achieved between two species
None of these

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Gas Chromatography
Resolution is proportional to the

square of the number of theoretical plates in a column
cube root of the number of theoretical plates in a column
number of theoretical plates in a column
square root of the number of theoretical plates in a column

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Gas Chromatography
Split injection is carried out by

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

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