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

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

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Gas Chromatography
Split injection is carried out by

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

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