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Gas Chromatography

Gas Chromatography
Which of the following is not used for detection in GC?

Electrical conductivity
Infrared spectroscopy
NMR
Flame ionisation

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Gas Chromatography
Which of the following gases is unsuitable for use as a GC carrier gas?

All of these
Nitrogen
Helium
Oxygen

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Gas Chromatography
A retention gap is placed between the injector and the front of the column to

prevent backflush of the injected solution
retain contaminants and prevent them from reaching the column
All of these
retain the sample and release it gradually to the column

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Gas Chromatography
Headspace analysis is carried out in order to

determine the psychological state of the tutor
analyse the column contents ahead of the sample
analyse volatile compounds from solid or liquid samples
determine non-volatiles

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

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

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Gas Chromatography
What are the benefits of decreasing the column internal diameter?

Increased sample capacity
Reduced risk of column overloading
Increased resolution
All of these

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