MOLECULAR SPECTROSCOPY

Question 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

Answer 1

d) All of the mentioned

Question 2

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

Answer 2

c) Translational energy

Question 3

The correct order of different types of energies is __________
a) Eel&raquo_space; Evib&raquo_space; Erot&raquo_space; E tr
b) Eel&raquo_space; Erot&raquo_space; Evib&raquo_space; E tr
c) Eel&raquo_space; Evib&raquo_space; Etr&raquo_space; E rot
d) Etr&raquo_space; Evib&raquo_space; Erot&raquo_space; E el

Answer 3

a) Eel&raquo_space; Evib&raquo_space; Erot&raquo_space; E tr

Question 4

The region of electromagnetic spectrum for nuclear magnetic resonance is __________
a) Microwave
b) Radio frequency
c) Infrared
d) UV-rays

Answer 4

b) Radio frequency

Question 5

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

Answer 5

d) All of the mentioned

Question 6

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

Answer 6

Spectroscopic methods require less time and less amount of sample than classical methods (1 mg).

Question 7

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

Answer 7

b) False

Question 8

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

Answer 8

a) Between vibrational and rotational levels

Question 9

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

Answer 9

c) Presence of unpaired electron in a molecule

Question 10

Sample recovery is possible after spectroscopic analysis because the sample is not chemically affected.
a) True
b) False

Answer 10

a) True