Other questions in this quiz

2. Which is NOT a limitation of gas chromatography?

  • substances can 'hide' beneath each other so will not be detected
  • unknown compounds have no reference Rf value
  • unknown compounds have no reference retention time
  • substances have the same retention times

3. Which is NOT a limitation of thin layer chromatography?

  • similar compounds have similar retention times
  • may be difficult to find a solvent which will separate all components
  • similar compounds have similar Rf values
  • unknown compounds have no Rf value for comparison

4. What is the benefit of coupling gas chromatography with mass spectrometry

  • mass spectroscopy separates the compounds and retention times can be compared to a database
  • gas chromatography separates compounds and mass spectra can be compared to a database
  • both the retention time and mass spectra can be used to improve the reliability of the identification

5. Which is NOT a use of GC-MS?

  • treatment of strokes
  • drug testing
  • airport security
  • forensic analysis

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