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Chemical Technician (Analytical Chemistry) > Absorption Spectrometry > Flashcards

Absorption Spectrometry Flashcards

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1
Q
  1. The analysis of electromagnetic radiation scattered,
    absorbed or emitted by the molecule is called
    a) Kaleidoscopy
    b) Astronomy
    c) Spectroscopy
    d) Anatomy
A

c) Spectroscopy

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2
Q
  1. The energy level with lower energy is called
    a) Ground state energy level
    b) Initial state energy level
    c) Excited state energy level
    d) All of the mentioned
A

a) Ground state energy level

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3
Q
  1. Absorption spectrum results when an electron in an
    atom undergoes a transition from
    a) Higher energy level to a lower one
    b) Lower energy level to a higher one
    c) Intermediate levels
    d) All of the mentioned
A

b) Lower energy level to a higher one

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4
Q
  1. The energy of a photon is given by
    a) h/ν
    b) ν/h
    c) 1/hν
    d) hν
A

d) hν

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5
Q
  1. The spectra can be broadly classified into two
    categories. They are
    a) Atomic and molecular spectra
    b) Atomic and electronic spectra
    c) Molecular and electronic spectra
    d) None of the mentioned
A

a) Atomic and molecular spectra

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5
Q
  1. Select the incorrect statement from the following
    option.
    a) Emission spectrum results when an electron in an atom undergoes a transition from excited state to the ground state
    b) In the emission spectrum, transition takes place with the emission of a photon of energy hν
    c) In the emission spectrum, transition takes place with the absorption of a photon of energy hν
    d) All of the mentioned
A

c) In the emission spectrum, transition takes place with the absorption of a photon of energy hν

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5
Q
  1. Select the correct statement from the following options.
    a) Molecular spectra arises from the transition of an
    electron between the molecular energy levels
    b) In molecular transitions, electronic, rotational and
    vibration transitions occurs
    c) Molecular spectra is more complicated than atomic
    spectra
    d) All of the mentioned
A

d) All of the mentioned

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6
Q
  1. In atomic spectroscopy, only electronic transitions are involved.
    a) True
    b) False
A

a) True

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7
Q
  1. Spectroscopy deals with the transition that a molecule undergoes on the absorption of suitable radiations determined by quantum mechanical selection rules.
    a) True
    b) False
A

a) True

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7
Q
  1. The necessary condition for absorption spectrum is that
    a) hν should be greater than the energy difference
    b) hν should be smaller than the energy difference
    c) hν should be equal to the energy difference
    d) None of the mentioned
A

c) hν should be equal to the energy difference

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8
Q
  1. During the motion, if the centre of gravity of molecule changes, the molecule possess
    a) Electronic energy
    b) Rotational energy
    c) Translational energy
    d) Vibrational energy
A

c) Translational energy

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9
Q
  1. The different types of energies associated with a
    molecule are
    a) Electronic energy
    b) Vibrational energy
    c) Rotational energy
    d) All of the mentioned
A

d) All of the mentioned

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10
Q
  1. The correct order of different types of energies is
    a) E_el&raquo_space; E_vib&raquo_space; E_rot&raquo_space; E_tr
    b) E_el&raquo_space; E_rot&raquo_space; E_vib&raquo_space; E_tr
    c) E_el&raquo_space; E_vib&raquo_space; E_tr&raquo_space; E_rot
    d) E_tr&raquo_space; E_vib&raquo_space; E_rot&raquo_space; E_el
A

a) E_el&raquo_space; E_vib&raquo_space; E_rot&raquo_space; E_tr

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11
Q
  1. Which of the following is an application of molecular
    spectroscopy?
    a) Structural investigation
    b) Basis of understanding of colors
    c) Study of energetically excited reaction products
    d) All of the mentioned
A

d) All of the mentioned

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11
Q
  1. The region of electromagnetic spectrum for nuclear
    magnetic resonance is
    a) Microwave
    b) Radio frequency
    c) Infrared
    d) UV-rays
A

b) Radio frequency

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12
Q
  1. Select the correct statement from the following option.
    a) Spectroscopic methods require less time and more
    amount of sample than classical methods
    b) Spectroscopic methods require more time and more amount of sample than classical methods
    c) Spectroscopic methods require less time and less
    amount of sample than classical methods
    d) Spectroscopic methods require more time and less
    amount of sample than classical methods
A

c) Spectroscopic methods require less time and less
amount of sample than classical methods

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12
Q
  1. The results obtained by spectroscopic methods are less reliable, less reproducible and incorrect than classical methods.
    a) True
    b) False
A

b) False

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13
Q
  1. The transition zone for Raman spectra is
    a) Between vibrational and rotational levels
    b) Between electronic levels
    c) Between magnetic levels of nuclei
    d) Between magnetic levels of unpaired electrons
A

a) Between vibrational and rotational levels

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14
Q
  1. Sample recovery is possible after spectroscopic
    analysis because sample is not chemically affected.
    a) True
    b) False
A

a) True

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14
Q
  1. The criteria for electronic spin resonance is
    a) Periodic change in polarisability
    b) Spin quantum number of nuclei > 0
    c) Presence of unpaired electron in a molecule
    d) Presence of chromophore in a molecule
A

c) Presence of unpaired electron in a molecule

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15
Q
  1. Arrange the various electronic transitions in the order of increasing energy.
    a) n→σ* < π→π* < n→π* < σ→σ*
    b) n→π* < π→π* < n→σ* < σ→σ*
    c) n→σ* < n→π* < π→π* < σ→σ*
    d) σ→σ* < π→π* < n→π* < n→σ*
A

b) n→π* < π→π* < n→σ* < σ→σ*

15
Q
  1. The electronic spectra in the visible range span
    a) 25000-72000 cm^-1
    b) 25000-50000 cm^-1
    c) 12500-25000 cm^-1
    d) 15000-30000 cm^-1
A

c) 12500-25000 cm^-1

16
Q
  1. Which of the following transitions are of weak
    intensities and lie in the visible region?
    a) n→n*
    b) σ→σ*
    c) π→π*
    d) n→σ*
A

a) n→n*

17
Q
  1. What is the position of the band of alkanes?
    a) 190 nm
    b) 185 nm
    c) 217 nm
    d) 150 nm
A

d) 150 nm

18
Q
  1. Which of the following organic compound shows
    transition due to conjugation?
    a) Alkenes
    b) Saturated aliphatic ketones
    c) Conjugated dienes
    d) Alkanes
A

c) Conjugated dienes

19
Q
  1. Which of the following is not an auxochrome group?
    a) –OH
    b) –SH
    c) –OR
    d) –O_2
A

d) –O_2

20
Q
  1. Which of the following shift leads to the decreased
    intensity of absorption?
    a) Hypochromic
    b) Hyperchromic
    c) Hypsochromic
    d) Bathochromic
A

a) Hypochromic

21
Q
  1. Which of the following is an application of electronic
    spectroscopy?
    a) Detection of impurities
    b) Control of purification
    c) Study of kinetics of the chemical reaction
    d) All of the mentioned
A

d) All of the mentioned

21
Q
  1. Which of the following molecule have infrared active
    vibrations?
    a) NO
    b) CH4
    c) H2
    d) All of the mentioned
A

a) NO

22
Q
  1. What will be the absorbance if %T= 80?
    a) 0.5
    b) 0.05
    c) 0.097
    d) 0.97
A

c) 0.097

23
Q
  1. Select the correct statement from the following option.
    a) Infrared spectra can identify the unknown materials
    b) It can determine the amount of components in a
    mixture
    c) It can also determine the quality of a sample
    d) All of the mentioned
A

d) All of the mentioned

23
Q
  1. Which of the following is a limitation of the LambertBeer’s law?
    a) Scattering of light due to particles
    b) Fluorescence of sample
    c) Non-monochromatic radiation
    d) All of the mentioned
A

v

24
Q
  1. Vibrational spectroscopy involves the transitions falling in the spectral range of
    a) 100-1000 cm^-1
    b) 300-3000 cm^-1
    c) 400-4000 cm^-1
    d) 500-5000 cm^-1
A

c) 400-4000 cm^-1

24
Q
  1. Which of the region of IR spectra appears between
    (1400-600) cm^-1?
    a) Functional group region
    b) Fingerprint region
    c) Low-frequency region
    d) None of the mentioned
A

b) Fingerprint region

25
Q
  1. Which of the following cannot show a vibrational
    absorption spectrum?
    a) OCS
    b) H2O
    c) CO 2
    d) C H2 = C H2
A

d) C H2 = C H2

26
Q
  1. Which of the following is not a type of bending
    molecular vibration?
    a) Twisting
    b) Stretching
    c) Wagging
    d) Rocking
A

b) Stretching

27
Q
  1. What is the absorption frequency(cm-1) of –C=N
    functional group?
    a) 3610-3640
    b) 1690-1760
    c) 1180-1360
    d) 2850-2960
A

c) 1180-1360

28
Q
  1. Presence of a functional group in a compound can be established by using
    a) Chromatography
    b) IR spectroscopy
    c) Mass spectroscopy
    d) X-ray diffraction
A

b) IR spectroscopy

29
Q
  1. Select the incorrect option from the following option.
    a) IR spectroscopy helps in determination of purity
    b) IR spectroscopy helps in determination of force
    constant from vibrational spectrum
    c) IR spectroscopy helps in identifying an unknown
    compound
    d) None of the mentioned
A

d) None of the mentioned

30
Q
  1. IR spectroscopy helps in detecting the presence of
    hydrogen bonding.
    a) True
    b) False
A

a) True

31
Q
  1. The nuclei with a spin quantum number greater than _______ can exhibit the NMR phenomenon.
    a) 0
    b) 5
    c) 10
    d) -5
A

a) 0

31
Q
  1. The number of different orientations which a magnetic nucleus can take is
    a) 2I
    b) 2I-1
    c) 2I+1
    d) 4I
A

c) 2I+1

32
Q
  1. Number of NMR signals obtained in CH3COCH3 will be
    a) 6
    b) 3
    c) 2
    d) 1
A

d) 1

32
Q
  1. Select the incorrect statement from the following
    option.
    a) TMS stands for tetra methyl silane
    b) All the hydrogen in TMS have the same chemical shift
    c) TMS has a high boiling point, so it is not easily lost when holding the NMR sample
    d) TMS is relatively unreactive with most functional groups
A

c) TMS has a high boiling point, so it is not easily lost when holding the NMR sample

33
Q
  1. Propene as well as 2-Butene(cis) will show equal
    number of signals in their NMR spectra.
    a) True
    b) False
A

b) False

34
Q
  1. The NMR spectra of the functional isomers of the
    molecular formula C2H6O show _________ and _________
    signals respectively.
    a) 1, 2
    b) 1, 3
    c) 1, 4
    d) 1, 5
A

b) 1, 3

35
Q
  1. The number of signals in 1-propanol are _________
    while those in 2-propanol are ______
    a) 4, 3
    b) 4, 2
    c) 2, 4
    d) 3, 4
A

a) 4, 3

36
Q
  1. For NMR spectrum, carbon tetrachloride and water can be successfully used as a solvent.
    a) True
    b) False
    View Answer
A

a) True

37
Q
  1. In how many ways –CH3 protons can couple with the protons on adjacent carbon atom relative to the external
    field.
    a) 1
    b) 2
    c) 3
    d) 4
A

d) 4

38
Q
  1. Which of the following is inversely proportional to the chemical shifts positions (δ)?
    a) Frequency of unknown group of protons
    b) Frequency of TMS
    c) Operating frequency of the instrument
    d) All of the mentioned
A

c) Operating frequency of the instrument

Chemical Technician (Analytical Chemistry) (16 decks)

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