24 Chromatography & Instrumentation MCQ2
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Questions and Answers

What is the principle of separation in High Performance Liquid Chromatography?

  • Different components of a mixture have different boiling points
  • Different components of a mixture have different interactions with the stationary and mobile phases
  • Different components of a mixture have different tendencies to adsorb onto very fine particles of a solid (correct)
  • Different components of a mixture have different molecular weights

What is the purpose of the flame in Atomic Absorption Spectroscopy?

  • To convert the sample into a gas
  • To convert the sample element into atoms of that element (correct)
  • To detect the sample
  • To ionize the sample

What is the relationship between absorbance and concentration in Atomic Absorption Spectroscopy?

  • Absorbance is exponential to concentration
  • Absorbance is inversely proportional to concentration
  • Absorbance is logarithmic to concentration
  • Absorbance is directly proportional to concentration (correct)

What is the purpose of the mobile phase in chromatography?

<p>To transport the sample along the column (C)</p> Signup and view all the answers

What is the principle of separation in Gas Chromatography?

<p>Different components of a mixture have different interactions with the stationary and mobile phases (A)</p> Signup and view all the answers

What is the primary principle of separation in a mass spectrometer?

<p>Relative atomic masses (C)</p> Signup and view all the answers

What is the purpose of vaporisation in a mass spectrometer?

<p>To convert molecules into ions (D)</p> Signup and view all the answers

What is the relationship between absorbance and concentration in ultraviolet spectroscopy?

<p>Absorbance is directly proportional to concentration (D)</p> Signup and view all the answers

What is the purpose of passing UV light through a blank in ultraviolet spectroscopy?

<p>To obtain a reference spectrum (A)</p> Signup and view all the answers

What is the primary application of mass spectrometry in environmental analysis?

<p>Analysis of gases from a waste dump (D)</p> Signup and view all the answers

What is the purpose of ionisation in a mass spectrometer?

<p>To convert molecules into ions (C)</p> Signup and view all the answers

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