SPECTROSCOPY MCQs
Which radiation has valence electron transitions?
- Microwave
- X-rays
- y-rays
- Visible
Visible
The difference between the incident and scattered frequencies in the Raman spectrum is called the
- Raman frequency
- Anti-Stoke’s line
- Stoke’s line
- P-branch
Raman frequency
How many normal modes of vibration are possible for CO2 molecule?
- 4
- 2
- 3
- 1
4
The commonly helpful and used units for wavelength is
- Centimeter
- Micrometer
- Nanometer
- All of A, B, and C
All of A, B, and C
The degree of freedom for stretching motion for non-linear (acyclic) molecules is
- N-1
- N-5
- N-2
- N-4
N-1
Which radiation has high energy?
- Radio waves
- Microwaves
- Visible
- Ultraviolet
Ultraviolet
Which radiation has high frequency?
- y-rays
- Microwaves
- Infrared
- Radio waves
y-rays
Which radiation has rotational phenomenon?
- Microwave
- Infrared
- X-rays
- Visible
Microwave
Which radiation has vibrational transitions?
- Infrared
- y-rays
- Microwave
- X-rays
Infrared
Which molecule is not symmetric top?
- Hâ‚‚O
- BCI3
- CH3CI
- BF3
Hâ‚‚O
When all the three principal moments of inertia of a molecule are equal, it is called
- Symmetric top
- Prolate symmetric top
- Asymmetric top
- Spherical top
Spherical top
Which information is spectra of a obtained from rotational molecule?
- Molecular structure
- Dipole moment
- Atomic mass
- All of A, B, and C
All of A, B, and C
Which technique is helpful and used for functional group identification?
- FTIR spectroscopy
- Electronic spectroscopy
- NMR spectroscopy
- Rotational spectroscopy
FTIR spectroscopy
The source of radiation in rotational spectroscopy is
- Klystron valve
- Deuterium lamp.
- Sodium lamp
- Tungsten lamp
Klystron valve
Rotational spectra is observed in which region?
- Near infrared region
- Ultraviolet region
- Visible region
- Far infrared region
Far infrared region
Which relationship is true regarding molecular energy levels?
- E(vibrational) > E(electronic) > E(rotational)
- E(rotational) > E(vibrational) > E(electronic)
- E(electronic) > E(rotational) > E(vibrational)
- E(electronic) > E(vibrational) > E(rotational)
E(electronic) > E(vibrational) > E(rotational)
The selection rule for the transition in rotational energy levels in the Raman spectrum is
- ∆J = ±2
- ∆J = +1
- ∆J = +2
- ∆J = ±1
∆J = ±2
Which radiation has longer wavelength?
- Radio wave
- Ultraviolet
- Microwave
- Gamma rays
Radio wave
What types of energy is possessed by molecules in the gases state?
- Translational energy
- Vibrational energy
- Rotational energy
- All of A, B, and C
All of A, B, and C
Which molecule is inactive?
- Nâ‚‚
- CO
- Hâ‚‚O
- HC ≡ CH
Nâ‚‚
How normal modes of vibration are possible for NH, molecule?
- 6
- 3
- 4
- 2
6
Which molecules do not show microwave spectrum?
- Spherical tops
- Symmetric tops
- Linear molecules
- Asymmetry tops
Spherical tops
The range of finger print region in IR spectroscopy is
- 4000-600 cm-1
- 4000-1450 cm-1
- 1450-500 cm-1
- None of A, B, and C
1450-500 cm-1
What is the source of light IR spectroscopy?
- Nernst filament
- Tungsten lamp
- Electron beam
- Deuterium lamp
Nernst filament
The detector helpful and used in IR spectroscopy is
- Photocell
- Bolometer
- UV detector
- None of A, B, and C
Bolometer
The energy associated with photon of light is ____ .
- c = vλ
- E=hc
- E=mc2
- E= hu
E= hu
The prism/monochromator spectroscopy is made up of
- KBr
- KCI
- CsCl
- CaCl2
KBr
The selection rule for transition in vibrational energy levels in IR spectrum is
- ∆v = ±4
- ∆v = ±2
- ∆v = ±3
- ∆v = ±1
∆v = ±1
Which of the spectrum arises when an electron jumps from one energy level to another?
- Electronic
- Vibrational
- Nuclear
- Rotational
Electronic
Normally the sample in rotational spectroscopy is in the form of
- Gas
- Liquid
- Solid
- None of A, B, and C
Gas
The rotational spectroscopy cannot be applied to detect
- Moment of inertia
- Interstellar space
- Molecular groupings
- Bond length
Molecular groupings
Which diatomic molecules will not give a rotational spectrum?
- Nâ‚‚
- HF
- NO
- CO
Nâ‚‚
The selection rule for transitions in rotational energy levels of a diatomic molecule is
- ∆J = +1
- ∆J = -1
- ∆J = ±2
- ∆J = ±1
∆J = ±1
The vibrational degree of freedom for linear molecules is
- 3N-5
- 3N-4
- 3N-6
- None of A, B, and C
3N-5
What is the degree of freedom for bending motion for non-linear molecules?
- 2N-4
- 2N-1
- 2N-2
- 2N-5
2N-5
What is the degree of freedom for bending motion for linear molecules?
- 2N-1
- 2N-5
- 2N-2
- 2N-4
2N-4
In vibrational spectroscopy the first overtone occurs at
- 2V1
- 4V1
- 3V1
- None of A, B, and C
2V1
In vibrational spectroscopy the second overtone occurs at
- 2V1
- 4V1
- 3V1
- None of A, B, and C
3V1
Which bands arise simply from addition of two or more fundamentals or overtones in IR?
- Overtones
- Difference band
- Addition bands
- Subtraction bands
Addition bands
Which is not an addition band?
- V1 – Vâ‚‚
- 2V1 + V2
- V1 + V â‚‚ + V3
- V1 + V2
V1 – Vâ‚‚
The vibrational degree of freedom for non-linear molecules is
- 3N-6
- 3N-5
- 3N-4
- None of A, B, and C
3N-6
When two vibrational frequencies resonate and exchange energy, the phenomenon is called _____ .
- Fermi-resonance
- Stark effect
- Conjugation
- Zeeman effect
Fermi-resonance
Which is true about skeletal vibrations?
- They usually fall in the range of 1400-700 cm-1
- They arise from linear structures
- They arise from branched chain structures
- All of A, B, and C
All of A, B, and C
The detector helpful and used rotational spectroscopy is
- Photocell
- Conductivity detector
- Radio receiver
- Bolometer
Radio receiver
The range of functional group region in IR spectroscopy is
- 4000-1450 cm-1
- 2000-500 cm-1
- 4000-600 cm-1
- None of A, B, and C
4000-1450 cm-1
Which is not a difference band?
- V1 – Vâ‚‚
- 2V1 + V2
- V1 + Vâ‚‚ + V3
- V1 + V2
V1 + V2
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