Gas Chromatography

Sample retention in the column is measured by

A:

retention time

B:

retention factor

C:

retention index

D:

all of these

Answer: D

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What are the benefits of decreasing the column internal diameter?

A:

Increased sample capacity

B:

Increased resolution

C:

Reduced risk of column overloading

D:

All of the above

Answer: B

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The column is heated to

A:

prevent analyte condensation within the column

B:

control elution of the different analytes

C:

reduce band broadening to get sharper peaks

D:

all of these

Answer: D

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

A:

it is inert

B:

it has a lower viscosity

C:

it doubles up as a party gas for balloons and funny voices

D:

all of above

Answer: D

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What does the selectivity factor describe?

A:

The proportional difference in widths of two chromatographic peaks

B:

The maximum number of different species which a column can separate simultaneously

C:

The relative separation achieved between two species

D:

None of the above

Answer: C

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Questions for: Gas Chromatography