GAS CHROMATOGRAPHY QUIZ

None are used as stationary phases

Silica

Polysiloxanes

Cyclodextrins

it is inert

all of above

it has a lower viscosity

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

traces of the stationary phase are eluted

the column is cracked and stationary phase leaks out

the column breaks during installation and causes personal injury

elution of the analyte is extended over time

Increased resolution

Non-linear detector response

Constant resolution

Decreased resolution

Reduced risk of column overloading

Increased sample capacity

All of these

Increased resolution

Nitrogen

Oxygen

Helium

All of these

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 spread evenly along the column

the sample is homogenously spread along the column

None of these

estimate the efficiency of a column

measure the distribution of the analyte between mobile and stationary phases

determine the thickness of the stationary phase

None of these

The proportional difference in widths of two chromatographic peaks

The relative separation achieved between two species

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

Optimum mobile phase flow rate

Optimum column temperature

The selectivity factor

Optimum column length