Chapter 2 - Gas Chromatography

Retention of analytes in Gas Solid Chromatography is based on physical sorption.

• TRUE

• FALSE

Gas separation is based on ______ and _________.

• affinity, volatility

• polarity, volatility

• boiling point, affinity

• boiling point, volatility

The analyte interacts with the carrier gas.

• TRUE

• FALSE

A highly dense gas gives best efficiency since the diffusivity is _______,

but a low density carrier gas gives _______.

• higher, slower velocity

• higher, faster velocity

• lower, faster velocity

• lower, slower velocity

____ diffusion of solute between mobile phase and stationary phase will lead to ____ C term.

• Slow, smaller

• Slow, higher

• Rapid, higher

• Rapid, smaller

Which one is not type of capillary column?

• WCOT

• SWOT

• SCOT

• PLOT

Choose the correct order of column in term of higher resolution (Rs).

• WCOT > SCOT > PLOT > Packed

• SCOT > PLOT > WCOT > Packed

• WCOT > PLOT > SCOT > Packed

• PLOT > SCOT > packed > WCOT

Which one is not important is selection of GC column?

• Film thickness of stationary phases

• Type of mobile phase

• Colum length

• Column inner diameter

Which one is not an ideal characteristic of solid support in stationary phase?

• Inert

• Strong

• high surface area

• low porosity

Gas chromatography based on melting point of the components in the sample.

• TRUE

• FALSE