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Free Spectroscopy and Analysis MCQs with Answers

47 Spectroscopy and Analysis MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.

Spectroscopy studies how substances absorb, emit or interact with electromagnetic radiation. Coverage includes ultraviolet-visible absorption, infrared identification of functional groups, Beer-Lambert law, spectral interpretation and the use of spectroscopic data to identify or determine the concentration of chemical substances.

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47 questions · page 3 of 3

41. The water formed in the combustion analysis is usually absorbed by:

  • A. Mg (NO3)2
  • B. Mg (ClO4)2
  • C. Mg (OH)2
  • D. Mg (ClO2)2

Explanation: The correct answer is Mg (ClO4)2, or magnesium perchlorate, which is widely used in combustion analysis as a drying agent due to its…

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Correct answer: Mg (ClO4)2

42. The spin states of a nucleus of an atom in absence of applied magnetic field have:

  • A. Different energies
  • B. Equal energies
  • C. Zero energies
  • D. High energies

Explanation: In the absence of an applied magnetic field, the spin states of a nucleus of an atom have equal energies.

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Correct answer: Equal energies

43. The functional group region in infra-red spectrum lies between:

  • A. 500 - 1300 cm-1
  • B. 600 - 1500 cm-1
  • C. 1500 - 4000 cm-1
  • D. 2500 - 3500 cm-1

Explanation: The functional group region in an infrared spectrum ranges from 1500 to 4000 cm-1.

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Correct answer: 1500 - 4000 cm-1

44. The infrared spectra commonly referred to as IR spectra is usually expressed as:

  • A. Wavelength
  • B. Wavenumber
  • C. Frequency
  • D. All of the above

Explanation: The correct answer is All of the above. Infrared spectra can be expressed in terms of wavelength, wavenumber, or frequency, each offering…

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Correct answer: All of the above

45. Which of the following radiations cannot cause excitation in the molecule ?

  • A. Red Colour
  • B. Green Colour
  • C. Ultra Voilet
  • D. None of the above

Explanation: The answer is D as all the mentioned radiations can excite molecules.All electromagnetic radiation, including red and green colours of…

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Correct answer: None of the above

46. How many types of "NMR" protons are there in Isopropyl chloride?

  • A. 2
  • B. 6
  • C. 4
  • D. 8

Explanation: In isopropyl chloride, there are 6 different types of "NMR" protons. This means that there are 6 unique environments for the protons in…

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Correct answer: 6

47. Which of the following methods, relatively gives more information about the structure of an organic compound:

  • A. Mass Spectroscopy
  • B. NMR Spectroscopy
  • C. IR Spectroscopy
  • D. U.V Visible Spectroscopy

Explanation: Among the options provided, NMR (Nuclear Magnetic Resonance) Spectroscopy gives more detailed information about the structure of an…

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Correct answer: NMR Spectroscopy
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