Question 1

The retention time in gas chromatography is the time it takes for a compound to pass through the chromatography column.

A column is packed with a stationary phase that is polar.

Which of the following will have the longest retention time in the column?

  A  

hexane

  B  

hex-1-ene


  C  

pentane

  D  

pentan-1-ol

0

/

1

Question 2

The diagram below shows a gas chromatogram.

Which statement about the gas chromatogram is correct?

  A  

the mixture consisted of at least 5 different substances

  B  

substance 5 came out of the column first

  C  

substance 1 had the greatest affinity for the stationary phase

  D  

substance 5 had the greatest affinity for the mobile phase

0

/

1

Question 3

What describes a substance with a high retention time in gas-liquid chromatography?

  A  

high volatility

  B  

high solubility in the stationary phase


  C  

high affinity for the mobile phase


  D  

non-polar molecules

0

/

1

Question 4

Which statement about gas-liquid chromatography is correct?

  A  

the column consists of a low boiling liquid on a porous support

  B  

the compound with the longest retention time comes out first

  C  

the emerging compounds can be detected by mass spectrometry

  D  

the sample does not need a carrier gas

0

/

1