Question56:-The expected number of ESR signals for methyl free radical and
benzen anion are respectively

A:-7 and 10

B:-4 and 7

C:-4 and 10

D:-7 and 25

Correct Answer:- Option-B

Question57:-Which one of the following is false for Doppler broadening of spectral
lines

A:-Doppler broadening of peak is Gaussian in character

B:-Doppler broadening depends on the molar mass of gas molecule
C:-Doppler broadening is proportional to temperature

D:-Doppler broadening is proportional to pressure of the gas
Correct Answer:- Option-D

Question58:-ldentify the statement regarding the reference molecule used in NMR
spectrsocopy

A. TMS will give weak NMR absorption even in dilute solutions

B. The Shielding of protons in TMS is greater than in most organic molecules

C. The methyl group of DSS resonate at a different position of the methyl group of
TMS

D. DSS or its sodium salt is more often used as calibration standard of NMR for
protein experiments in water

A:-A and B are correct
B:-B and C are correct
C:-C and D are correct
D:-D and B are correct
Correct Answer:- Option-D

Question59:-The transitions of the electron between the molecular orbitals for the
absorption in the region 200 to 800 nm is not possible for

A:-o to o*
B:-f] to +
C:-n to o*
D:-n to []*
Correct Answer:- Option-A

Question60:-Which of the following are the Quantum mechanics methods used in
computational chemistry

A:-Molecular mechanics method and Ab initio method
B:-Ab initio method and DFT
C:-Semi Empirical method and molecular dynamics method