GAS CHROMATOGRAPHY QUIZ

the flow to the column is switched on and off repeatedly

compounds trapped on one column are eluted to another column

any of the above

one column is removed and replaced by another

Oxygen

Nitrogen

All of these

Helium

None of these

The proportional difference in widths of two chromatographic peaks

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

The relative separation achieved between two species

square root of the number of theoretical plates in a column

square of the number of theoretical plates in a column

number of theoretical plates in a column

cube root of the number of theoretical plates in a column

reduce polarity of the analytes

All of these

increase the detector response

increase volatility of the analytes

measure the distribution of the analyte between mobile and stationary phases

determine the thickness of the stationary phase

None of these

estimate the efficiency of a column

Cyclodextrins

Polysiloxanes

Silica

None are used as stationary phases

All of these

Thermal conductivity

Infra-red detector

Electron-capture detector

splitting off some of the sample so that it does not enter the column

None of these

splitting the sample into smaller portions to inject at the same time through parallel ports

splitting the sample into smaller portions to inject sequentially

retention factor

retention index

all of these

retention time