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Questions on topic Molecular Spectroscopy from S.Chand Success Guide Physical Chemistry

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Q1. What is the fundamental principle behind molecular spectroscopy?
Absorption of light by molecules
Emission of light by molecules
Scattering of light by molecules
Refraction of light through molecules
Q2. Which type of spectroscopy deals with the transitions between rotational energy levels?
Infrared spectroscopy
Raman spectroscopy
Microwave spectroscopy
Ultraviolet-visible spectroscopy
Q3. In which region of the electromagnetic spectrum does UV-Vis spectroscopy operate?
400-700 nm
700-1000 nm
10^-6 to 10^-3 m
10^-10 to 10^-7 m
Q4. What is the selection rule for allowed transitions in UV-Vis spectroscopy?
Δn = ±1
Δl = ±1
ΔS = 0
ΔJ = 0, ±1
Q5. Which technique is commonly used to study vibrational transitions in molecules?
NMR spectroscopy
Raman spectroscopy
Fluorescence spectroscopy
X-ray diffraction
Q6. What is the significance of the Beer-Lambert law in spectroscopy?
It describes the relationship between energy and frequency.
It relates the absorbance of light to the concentration of a solution.
It explains the scattering of light by molecules.
It determines the wavelength of maximum absorbance.
Q7. In IR spectroscopy, what type of molecular vibrations are primarily observed?
Translational vibrations
Rotational vibrations
Stretching and bending vibrations
Electronic transitions
Q8. What does a peak in an IR spectrum represent?
Absorption of light at a specific wavelength
Emission of light at a specific wavelength
Scattering of light
Reflection of light
Q9. Which of the following transitions is not typically observed in microwave spectroscopy?
Rotational transitions
Vibrational transitions
Electronic transitions
Nuclear spin transitions
Q10. What type of molecular information can be obtained from Raman spectroscopy?
Molecular mass
Molecular structure and bonding
Electronic configuration
Thermal stability