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Gas Chromatography

Gas Chromatography
The GC trace obtained after an experiment is called a

chromatophore
graph
chromatogram
chromatograph

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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
The column is heated to

reduce band broadening to get sharper peaks
control elution of the different analytes
prevent analyte condensation within the column
all of these

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

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

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Gas Chromatography
Which of these effects result from slow injection of a large sample volume?

Non-linear detector response
Increased resolution
Decreased resolution
Constant resolution

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

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