Quiz on Infrared Spectroscopy

What is the primary source of infrared radiation?

• Ultraviolet light

• Thermal radiation

• X-ray radiation

• Visible light

Which region of the electromagnetic spectrum does infrared radiation lie?

• Between ultraviolet and visible

• Between visible and microwave

• Between X-ray and ultraviolet

• Between microwave and radio frequency

What is the main advantage of infrared spectroscopy?

• It requires no sample preparation

• It is the fastest analytical technique

• It can identify complete unknowns

• It can detect single atoms

What type of molecular motion is associated with symmetric stretching?

• Atoms rotate around a central bond axis

• Atoms move toward or away from each other simultaneously

• Atoms move in opposite directions

• Atoms move in a scissoring motion

What does the fingerprint region in an IR spectrum indicate?

• The molecular weight of the compound

• The temperature of the sample

• The identity of compounds

• The presence of specific functional groups

Which of the following is NOT a type of bending mode?

• Scissoring

• Rocking

• Stretching

• Wagging

What is the typical unit for measuring wavenumbers in IR spectroscopy?

• Kilometers

• Reciprocal centimeters

• Micrometers

• Nanometers

What is the main limitation of FTIR spectroscopy?

• It cannot detect complex mixtures

• It is less sensitive than dispersive instruments

• It requires extensive sample preparation

• It cannot analyze aqueous solutions

Which of the following factors does NOT affect the position of absorption peaks?

• Mass of the atoms

• Temperature of the sample

• Bond strength

• Electronegativity

What is the purpose of the beam splitter in an FTIR spectrometer?

• To focus the infrared light

• To separate the light into different wavelengths

• To create an interferogram

• To detect the infrared radiation