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24 Chromatography & Instrumentation MCQ1

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24 Chromatography & Instrumentation MCQ1

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Questions and Answers

What is the principle behind the separation of positively charged ions in a mass spectrometer?

Their relative atomic masses (correct)

Their weights

Their relative ionic charges

Their relative atomic volumes

What is the purpose of vaporisation in a mass spectrometer?

To detect the ions

To accelerate the ions

To break the molecules into ions and free electrons (correct)

To separate the ions

What is the formula for Rf in chromatography?

Distance travelled by the component - Distance travelled by the solvent front

Distance travelled by the solvent front / Distance travelled by the component

Distance travelled by the component / Distance travelled by the solvent front (correct)

Distance travelled by the solvent front - Distance travelled by the component

What type of spectrum is obtained in infrared spectroscopy?

Absorption spectrum Signup and view all the answers

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

Absorbance is directly proportional to concentration Signup and view all the answers

Which type of chromatography uses a solid stationary phase and a liquid mobile phase?

Column chromatography Signup and view all the answers

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

To obtain an absorption spectrum Signup and view all the answers

What is the principle of High Performance Liquid Chromatography?

Different components of a mixture have different tendencies to adsorb onto very fine particles of a solid Signup and view all the answers

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

To convert the sample element into atoms of that element Signup and view all the answers

What is the result of the absorption of infrared radiation by molecules in infrared spectroscopy?

The molecules are excited to a higher energy state Signup and view all the answers

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

Absorbance is directly proportional to concentration Signup and view all the answers

What type of pollutants can be identified using infrared spectroscopy?

Organic pollutants in water Signup and view all the answers

What is the purpose of obtaining an absorption spectrum in ultraviolet absorption spectroscopy?

To identify the presence of a specific substance Signup and view all the answers