GAS CHROMATOGRAPHY QUIZ

Doubling the column's length increases resolution by a factor of

(2)0.5

3

4

2

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

Nitrogen

All of these

Helium

Oxygen

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What are the benefits of decreasing the column internal diameter?

Reduced risk of column overloading

Increased resolution

Increased sample capacity

All of these

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What useful information can be found from a Van Deemter plot?

The selectivity factor

Optimum mobile phase flow rate

Optimum column length

Optimum column temperature

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Sample retention in the column is measured by

all of these

retention index

retention factor

retention time

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In column switching chromatography

one column is removed and replaced by another

any of the above

compounds trapped on one column are eluted to another column

the flow to the column is switched on and off repeatedly

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

all of above

it has a lower viscosity

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

it is inert

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

Non-linear detector response

Decreased resolution

Increased resolution

Constant resolution

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

None are used as stationary phases

Cyclodextrins

Polysiloxanes

Silica

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Sample injection is considered successful if

the sample is spread evenly along the column

all of the sample in the injector has been added to the column

the sample is concentrated at the start of the column

the sample is homogenously spread along the column

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