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Gas Chromatography

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

Infrared spectroscopy
NMR
Flame ionisation
Electrical conductivity

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

All of these
Nitrogen
Oxygen
Helium

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

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

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Gas Chromatography
Sample retention in the column is measured by

retention time
retention index
all of these
retention factor

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

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

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Gas Chromatography
Which of the following are not used as stationary phases in a GC column?

Polysiloxanes
Silica
Cyclodextrins
None are used as stationary phases

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