ABC26PH1091 · A molecule, AX, has a vibrational energy of 1000 cm-1 and rotational energy of 10 cm-1. Another molecule, BX, has a vibrational energy of… · JUNE 2011
ABC26PH0103 · At room temperature, which molecule has the maximum rotational entropy? · JUNE 2011self-practice
ABC26PH1092 · At room temperature, which molecule has the maximum rotational entropy? · JUNE 2011
ABC26PH0105 · The Q band in the vibrational spectrum of acetylene is observed in the · DEC 2011
ABC26PH1094 · The Q band in the vibrational spectrum of acetylene is observed in the · JUNE 2011
ABC26PH1095 · In IR spectrum of [Co(CN)5 H ]3- the Co-H stretch is observed at 1840 cm-1. The (Co-D) stretch in [Co(CN)5 D ]3- will appear at nearly · JUNE 2011
ABC26PH1096 · The Stark splitting for a given field is larger for a molecule AX as compared to BX . Which one of the following is true? ( mu is the… · JUNE 2011
ABC26PH0106 · The sodium D lines are due to 2P1/2 2S1/2( Delta E1) and 2P1/2 2S1/2( Delta E2) transitions. The splitting due to spin-orbit coupling in 2p… · DEC 2011self-practice
ABC26PH1098 · The NMR spectrum of AX, exhibits lines at delta =2.1 and 2.3 ppm (for X type protons) and = 4.1, 4.3, 4.5 and 4.7 ppm (for A type protons)… · JUNE 2011
ABC26PH1104 · The absorption spectrum of O2 shows a vibrational structure that becomes continuum at 56875 cm-1. At the continuum, it dissociates into one… · DEC 2012
ABC26PH1107 · In NMR spectroscopy, the product of the nuclear 'g' factor (gN ), the nuclear magneton ( ) and the magnetic field strength (B0 ) gives the · JUNE 2013
ABC26PH1108 · An AX system gave 4 lines at 4.72, 4.6, 1.12 and 1.0 ppm away from the TMS using an nmr spectrometer operating at 100 MHz . What are the… · JUNE 2013
ABC26PH1109 · The molecule with the smallest rotation partition function at any temperature among the following is: · DEC 2013
ABC26PH0109 · The atomic masses of fluorine and hydrogen are 19.0 and 1.0 amu, respectively (1\,amu=1.6710-27\,kg). The bond length of HF is 2.0\,. The… · DEC 2019
ABC26PH1110 · The atomic masses of fluorine and hydrogen are 19.0 and 1.0 amu, respectively ( 1 amu=1.67 10-27 kg). The bond length of HF is 2.0 . The… · DEC 2013
ABC26PH0110 · The C=O bond length is 120 pm in CO2. The moment of inertia of CO2 would be close to (masses of C and O are 1.9 10-27 kg and 2.5 10-27 kg… · DEC 2019
ABC26PH1111 · The C=O bond length is 120 pm in CO2. The moment of inertia of CO2 would be close to (masses of C and O are 1.9 10-27 kg and 2.5 10-27 kg… · DEC 2013
ABC26PH1114 · If the bond length of a heteronuclear diatomic molecule is greater in the upper vibrational state, the gap between the successive… · DEC 2014
ABC26PH1115 · The symmetric rotor among the following is · JUNE 2015
ABC26PH1116 · The nuclear g-factors of 1 H and 14 N are 5.6 and 0.40 respectively. If the magnetic field in an NMR spectrometer is set such that the… · JUNE 2015
ABC26PH1118 · If the reduced mass of a diatomic molecule is doubled without changing its force constant, the vibrational frequency of the molecule will be · DEC 2015
ABC26PH1121 · The vibrational frequency of a homo-nuclear diatomic molecule is v. The temperature at which the population of the first excited state will… · DEC 2015
ABC26PH1122 · The 1 H NMR frequency at 1.0T is 42.4 MHz. If the gyromagnetic ratios of 1 H and 13 C are 27 107 and 6.75 107 T-1 S-1 respectively, what… · DEC 2015
ABC26PH1124 · Upon application of a weak magnetic field, a line in the microwave absorption spectrum of rigid rotor splits into 3 lines. The quantum… · JUNE 2016
ABC26PH0112 · 1H NMR spectrum of an organic compound recorded on a 500 MHz spectrometer showed a quartet with line positions at 1759, 1753, 1747, 1741… · DEC 2016self-practice
ABC26PH1125 · 1 H NMR spectrum of an organic compound recorded on a 500 MHz spectrometer showed a quartet with line positions at 1759, 1753, 1747, 1741… · DEC 2016
ABC26PH0113 · Vibrations of diatomic molecules are usually modelled by a harmonic potential. If the potential is given by x2, the correct statement is · DEC 2016self-practice
ABC26PH1126 · Vibrations of diatomic molecules are usually modelled by a harmonic potential. If the potential is given by x2, the correct statement is · DEC 2016
ABC26PH1127 · The transition that belongs to the Lyman series in the hydrogen-atom spectrum is · DEC 2016
ABC26PH0114 · The rotational constant and the fundamental vibrational frequency of HBr are, respectively, 10\,cm-1 and 2000\,cm-1. The corresponding… · DEC 2016
ABC26PH1128 · The rotational constant and the fundamental vibrational frequency of HBr are, respectively, 10\,cm-1 and 2000\,cm-1. The corresponding… · DEC 2016
ABC26PH0115 · In a 200 MHz NMR spectrometer, a molecule shows two doublets separated by 2 ppm. The observed coupling constant is 10 Hz. The separation… · DEC 2016
ABC26PH1130 · In a 200 MHz NMR spectrometer, a molecule shows two doublets separated by 2 ppm. The observed coupling constant is 10 Hz. The separation… · DEC 2016
ABC26PH0117 · For a certain magnetic field strength, a free proton spin transition occurs at 700 MHz. Keeping the magnetic field strength constant the… · JUNE 2017self-practice
ABC26PH1132 · For a certain magnetic field strength, a free proton spin transition occurs at 700 MHz . Keeping the magnetic field strength constant the… · JUNE 2017
ABC26PH1136 · The pair that contains a spherical top and a symmetric top, among the following, is · DEC 2017
ABC26PH1137 · The g-factors of 1 H and 13 C are 5.6 and 1.4 respectively. For the same value of the magnetic field strength, if the 1 H resonates at 600… · DEC 2017
ABC26PH1139 · A symmetric top molecule, among the following, is · JUNE 2018
ABC26PH1140 · Assuming harmonic approximation, the energy change for the reaction HCl+D2 DCl+HD in cm-1 is (the vibrational frequency data in cm-1 is… · JUNE 2018
ABC26PH1142 · The correct statements about HCl and DCl , among the following is · JUNE 2019
ABC26PH0119 · The frequency of O-H stretch occurs at 3600\,cm-1. The O-D stretch frequency (in cm-1) would be closest to · 2011-2020self-practice
ABC26PH1144 · The frequency of O-H stretch occurs at 3600 cm-1. The O-D stretch frequency (in cm-1 ) would be closest to · DEC 2019
ABC26PH0120 · In the pure rotational microwave spectrum of a XY molecule, the adjacent lines are separated by 4\,cm-1. If the molecule is irradiated by a… · 2011-2020self-practice
ABC26PH1146 · The equilibrium dissociation energy of a diatomic molecule is 4.75 eV and its stretching frequency corresponds to 0.5 eV. The minimum… · DEC 2019
ABC26PH1148 · The energy separation of 12 C 16 O rotational energy levels between J =3 and J =9 is 24 cm-1. The rotational constant of 13 C16 O in cm1 is… · DEC 2019
ABC26PH1150 · Match the following Energy-dispersive X-ray spectroscopy (EDS) 9 · JUNE 2021
ABC26PH1151 · The molecule that will not absorb in the microwave region, but will absorb in the infra-red region · JUNE 2021
NMR ESR Physical
ABC26PH1097 · The uncertainty in the NMR frequency of a compound in liquid state (relaxation time =1 s ) is 0.1 Hz . The uncertainty in the frequency (in… · JUNE 2011
ABC26PH1123 · In an NMR spectrometer containing a 2.5 T magnet, Larmor precession frequency of 1 H is 100 MHz . The radiofrequency used in this… · JUNE 2016
Raman
ABC26PH0107 · The rotational constant of 14N2 is 2\,cm-1. The wave number of incident radiation in a Raman spectrometer is 20487\,cm-1. What is the wave… · DEC 2011