GAS CHROMATOGRAPHY QUIZ

Which of the following detectors give concentration-dependent signals?

All of these

Thermal conductivity

Infra-red detector

Electron-capture detector

TRUE ANSWER : ?
YOUR ANSWER : ?

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

it is inert

all of above

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

it has a lower viscosity

TRUE ANSWER : ?
YOUR ANSWER : ?

Sample retention in the column is measured by

all of these

retention time

retention factor

retention index

TRUE ANSWER : ?
YOUR ANSWER : ?

Headspace analysis is carried out in order to

analyse the column contents ahead of the sample

analyse volatile compounds from solid or liquid samples

determine non-volatiles

determine the psychological state of the tutor

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not used for detection in GC?

Electrical conductivity

Flame ionisation

NMR

Infrared spectroscopy

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following detectors give mass flow-dependent signals?

Thermal conductivity detector

Electron capture detector

All of these

Field ionisation detector

TRUE ANSWER : ?
YOUR ANSWER : ?

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

3

2

(2)0.5

4

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Polysiloxanes

None are used as stationary phases

Silica

Cyclodextrins

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Oxygen

Nitrogen

Helium

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

What is the typical internal diameter of fused silica capillary columns?

0.2-0.3 mm

0.3-0.5mm

0.5-1.0 mm

1.0-2.0 mm

TRUE ANSWER : ?
YOUR ANSWER : ?

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