Intro to Spectroscopy (UV-Vis, IR) - Higher Difficulty Problems

Q. In UV-Vis spectroscopy, what does a higher absorbance indicate about the concentration of a solution?
  • A. Lower concentration
  • B. Higher concentration
  • C. No correlation
  • D. Increased temperature
Q. In UV-Vis spectroscopy, what does a higher molar absorptivity indicate?
  • A. Lower concentration
  • B. Higher concentration
  • C. More efficient light absorption
  • D. Less efficient light absorption
Q. In UV-Vis spectroscopy, what does a peak at 280 nm typically indicate?
  • A. Presence of nucleic acids
  • B. Presence of proteins
  • C. Presence of carbohydrates
  • D. Presence of lipids
Q. In UV-Vis spectroscopy, what is the effect of increasing the path length of the sample cell?
  • A. Decreases absorbance
  • B. Increases absorbance
  • C. No effect on absorbance
  • D. Increases transmittance
Q. What is the primary interaction that occurs in UV-Vis spectroscopy?
  • A. Vibrational transitions
  • B. Rotational transitions
  • C. Electronic transitions
  • D. Nuclear transitions
Q. What is the significance of the fingerprint region in an IR spectrum?
  • A. It indicates the presence of aromatic compounds
  • B. It is unique to each molecule and aids in identification
  • C. It shows the molecular weight of the compound
  • D. It represents the electronic transitions
Q. What is the significance of the peak position in an IR spectrum?
  • A. It indicates the concentration of the sample
  • B. It reveals the molecular weight of the compound
  • C. It provides information about the types of bonds present
  • D. It determines the solubility of the compound
Q. What type of bond is primarily detected in the fingerprint region of an IR spectrum?
  • A. C-H bonds
  • B. O-H bonds
  • C. C-C bonds
  • D. Complex vibrations of multiple bonds
Q. What type of transition is primarily observed in the UV region of the spectrum?
  • A. Vibrational
  • B. Rotational
  • C. Electronic
  • D. Nuclear
Q. Which instrument is commonly used to measure the absorbance of a sample in UV-Vis spectroscopy?
  • A. Mass spectrometer
  • B. Chromatograph
  • C. Spectrophotometer
  • D. Fluorometer
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