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Atomic Structure & Quantum - Chemistry MCQ


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60 Questions MCQ Test Mock Test Series for IIT JAM Chemistry - Atomic Structure & Quantum

Atomic Structure & Quantum for Chemistry 2024 is part of Mock Test Series for IIT JAM Chemistry preparation. The Atomic Structure & Quantum questions and answers have been prepared according to the Chemistry exam syllabus.The Atomic Structure & Quantum MCQs are made for Chemistry 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Atomic Structure & Quantum below.
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Atomic Structure & Quantum - Question 1

The vibrational energy levels, v11 = 0 and v1 = 1 of a diatomic molecule are separated by 2143 cm-1. Its Anharmonicity (ωe Xe ) is 14 cm-1. The values of ωe (in cm-1) and first overtone (cm-1) of this molecules are respectively.

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Atomic Structure & Quantum - Question 2

The bond that gives the most intense band in the infrared spectrum for its stretching vibration is:

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Atomic Structure & Quantum - Question 3

In NMR spectroscopy, the product of the nuclear ‘g’ factor (gN), the Nuclear Magneton βN and the magnetic field strength (B0) gives the:

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Atomic Structure & Quantum - Question 4

The molecule with the smallest rotational constant (in the microwave spectrum) among the following is:

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Atomic Structure & Quantum - Question 5

"Phosphorescence" is represented as:

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Atomic Structure & Quantum - Question 6

The following is true of 2px, 2py and 2pz orbitals of a H-atom:

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Atomic Structure & Quantum - Question 7

The wave function for a quantum mechanical particle in a 1-dimetional box of length ‘a’ is given as . The value of ‘A’ for a box of length 200 nm is:

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Atomic Structure & Quantum - Question 8

Which hydrogenic atom ion has the wavelength difference between first line of Balmer and Lymen Series equal to 59.3 nm? (RH = 109678 cm–1).

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Atomic Structure & Quantum - Question 9

dz2 orbital has:

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Atomic Structure & Quantum - Question 10

The commutator [X3, px] is equal to:

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Atomic Structure & Quantum - Question 11

Which of the following is true for the radial part of the H atom wave function Rn, l(r) (n-principal quantum number and l-azimuthal quantum number) and the nodes associated with them:

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Atomic Structure & Quantum - Question 12

Which of the following radial distribution graphs correspond to l = 2 for H atom for the least value of ‘n’ for which l = 2 is allowed?

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Atomic Structure & Quantum - Question 13

The value of the commutation of 

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Atomic Structure & Quantum - Question 14

The difference between nth and (n + 1)th Bohr’s radius of H atom is equal to its (n –1)th Bohr’s radius the value of n is:

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Atomic Structure & Quantum - Question 15

Consider the following statements: (I) Electron density in the XY plane in 3d x2 -y2 orbital is zero (II) Electron density in the XY plane in 3dz2 orbital is zero (III) 2s orbital has one nodal surface (IV) For 2pz orbital, YZ is the nodal plane, Which are the correct statements

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Atomic Structure & Quantum - Question 16

At room temperature, which molecule has maximum rotational entropy?

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Atomic Structure & Quantum - Question 17

In IR spectrum of [Co(CN)5H]3–, the Co—H stretching is observed at 1840 cm–1. The Co—D stretch in [Co(CN)5D]3– will appear at nearly:

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Atomic Structure & Quantum - Question 18

In 400 MHz 1H MNR spectrum of an organic compound exhibited a doublet. The two lines of the doublet are at δ = 2.35 and 2.38 ppm. The coupling constant (J) value is:

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Atomic Structure & Quantum - Question 19

The spectroscopic technique, by which ground state dissociation energies of diatomic molecules can be estimated is:

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Atomic Structure & Quantum - Question 20

For reaction,

The correct observation is:

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Atomic Structure & Quantum - Question 21

Which is/are true:

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Atomic Structure & Quantum - Question 22

For an electron in a hydrogen atom, the wave function, ψ is proportional to exp(-r/a0), where a0 is the Bohr’s radius. What is the ratio of the probability of finding the electron at the nucleus to the probability of finding it at a0:

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Atomic Structure & Quantum - Question 23

Which one of the following is an acceptable wave function for an electron in the hydrogen atom? (r, θ, φ) denote the spherical polar co-ordinates and N is a suitable constant which you are allowed to choose suitably: 

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Atomic Structure & Quantum - Question 24

If the principal quantum number n = 6, the correct sequence of filling of electrons will be:

Atomic Structure & Quantum - Question 25

The ionization energy of H atom in its ground state is approximately 13.6 eV. The potential energy of He+, in its ground state is approximately:

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Atomic Structure & Quantum - Question 26

Vibrations of a diatomic molecule are usually modelled by a harmonic potential. If the potential is given by X2, the correct statement is:

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Atomic Structure & Quantum - Question 27

1H NMR spectrum of an organic compound recorded on a 500 MHz spectrometer showed a quartet with line positions at 1759, 1753, 1747, 1741 Hz. Chemical shift (s) and coupling constant (Hz) of the quartet are:

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Atomic Structure & Quantum - Question 28

Which of the following spectroscopic techniques will be useful to distinguish between M-SCN and M-NCS binding modes?

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Atomic Structure & Quantum - Question 29

The inters bond at 15000 cm–1 in UV visible spectrum of [Bu4N]2 Re2Cl8 is due to transition:

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Atomic Structure & Quantum - Question 30

The 1H NMR frequency at 1.07 T is 42.4 MHz. If gyromagnetic ratio of 1H and 13C are 2.7 × 107 and 6.75 × 107 T–1 S–1, respectively, what will be the 13C frequency at 1.07 T:?

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Atomic Structure & Quantum - Question 31

Which of the molecule(s) has/have a pure rotational spectrum:

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Atomic Structure & Quantum - Question 32

Which of the molecule(s) is/are infrared active:

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Atomic Structure & Quantum - Question 33

The set of allowed electronic transition among following is:

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Atomic Structure & Quantum - Question 34

Which is the following statement is/are wrong:

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Atomic Structure & Quantum - Question 35

Choose the correct statements among the following:

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Atomic Structure & Quantum - Question 36

The linear momentum of a particle describe by the wavefunction ψ(x) = Aeikx + Be-ikx; then which of the following statement(s) is/are correct:

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Atomic Structure & Quantum - Question 37

Which of the following graph(s) for wave function is/are unacceptable:

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Atomic Structure & Quantum - Question 38

Which of the following statements is/are correct?

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Atomic Structure & Quantum - Question 39

According to Bohr’s theory, the angular momentum of electron can have the value(s):

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Atomic Structure & Quantum - Question 40

Which of the following vibrational mode(s) is/are IR active:

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Atomic Structure & Quantum - Question 41

In an atom, the total number of electrons having quantum numbers n = 4, |Ml| = 1 and ms = –1/2 is:


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Atomic Structure & Quantum - Question 42

A higher energy wave function of the electron in a nanotube is described by the normalized wave function (2/L)1/2sin(2πx/L). What is the percentage probability of finding the electron between x = L/4 and x = L/2?


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Atomic Structure & Quantum - Question 43

Calculate the average value of radius (rounded up to two places, in Å) ‘r’ in 1s state of H-atom 
described by wave function 


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Atomic Structure & Quantum - Question 44

What would be degeneracy of H-atom corresponding to n = 4?


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Atomic Structure & Quantum - Question 45

The total number of orbitals associated with the principal quantum number 5 would be?


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Atomic Structure & Quantum - Question 46

The molar extinction coefficient of B (MW = 180) is 4 × 103 L mol–1 cm–1. One litre solution of C which contains 0.1358 g pharmaceutical preparations of B, shows an absorbance of 0.411 in a 1 cm quartz cell. The percentage (w/w) of B in pharmaceutical preparation is [rounded up to two decimal places]:


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Atomic Structure & Quantum - Question 47

The following data were obtained from vibrational fine structure in the vibronic spectrum of a diatomic Molecule: We = 512 cm–1, WeXe = 8 cm–1 Where We = energy associated with natural frequency of vibration Xe = Anharmonicity constant ​The dissociation energy (Dc) of molecule is (cm–


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Atomic Structure & Quantum - Question 48

Number of rotational symmetry axes for triclinic crystal system is:


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Atomic Structure & Quantum - Question 49

The nuclear g-factor of 1H and 14N are 5.6 and 0.40 respectively. If the magnetic field in an NMR spectrometer is set such that the proton resonates at 700 MHz, the 14N nucleus would resonate at (MHz)? [rounded up to first decimal place]


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Atomic Structure & Quantum - Question 50

Methylcyclohexane molecules may exist in one of the two conformation with the methyl group in either equatorial or axial position. The equatorial form is lower in energy with the axial form by 6kJ/mol. At a temp of 300 K, this difference in energy implies that relative population of molecules in axial and equatorial state is? [R = 8.314JK-1mol-1 rounded up to three decimal place]


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Atomic Structure & Quantum - Question 51

Calculate the most probable radius at which an electron will be found when it occupies a 1s orbital of a Ne9+ (in pm, rounded up to two decimal place): 


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Atomic Structure & Quantum - Question 52

Evaluate the root mean square distance, (r2)1/2 of the electron from the nucleus in the hydrogen 
atom described by the wave function  [in pm rounded up to two decimal place]


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Atomic Structure & Quantum - Question 53

Ground state energy of H-atom is –13.598 eV. The expectation value of Potential energy (in eV) would be? [rounded up to two decimal place]


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Atomic Structure & Quantum - Question 54

What would be the degeneracy of 5th energy level in 3D box of length ‘L’?


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Atomic Structure & Quantum - Question 55

What would be the 3rd radii (Å) of Be+3? [rounded up to two decimal place]


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Atomic Structure & Quantum - Question 56

The number of IR active vibrational modes is ammonia is?


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Atomic Structure & Quantum - Question 57

Calculate the frequency (in MHz, up to 2 decimal place) at which radiation comes in to resonance with proton (I = ½) spins in a 12 T magnetic field? (Given: γN = 2.675 × 108T–1s–1) [rounded up to first decimal place]


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Atomic Structure & Quantum - Question 58

Absorption spectrum of O2 shows a vibrational structure that becomes continuum at 56875 cm–1. At the continuum, it dissociates into one ground state atom (Og) and one excited state atom (Oe). The energy difference between Oe and Og is 15125 cm–1. The dissociation energy (cm–1) of G.S. O2 is:


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Atomic Structure & Quantum - Question 59

What is the shift of the resonance from TMS of a group of nuclei with δ = 3.50 and an operating frequency of 350 MHz (in kHz)? [rounded up to two decimal place]


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Atomic Structure & Quantum - Question 60

Calculate the relative populations of the J = 1 and J = 0 rotational states of HCl at 25°C? [up to 2 decimal place] (Given: BHCl = 10.591 cm–1) [rounded up to three decimal place]


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