Gas Chromatography
Helium is generally preferred as carrier gas over nitrogen and hydrogen because

it has a lower viscosity
it doubles up as a party gas for balloons and funny voices
all of above
it is inert

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Gas Chromatography
What does the selectivity factor describe?

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

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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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