PracBeeLogin

Structure of Atom PYQs - Last 10 Years

JEE Main / Chemistry / Physical Chemistry / 190 recent questions

ChemistryPhysical Chemistry2017-2026
All Structure of Atom PYQsLast 5 YearsCreate chapter test

Practice 190 JEE Main Chemistry questions from Structure of Atom. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.

190
PYQs on Page
Chemistry / Physical Chemistry
2017-2026
Year Range
Based on indexed question metadata
125
Last 5 Years
2022-2026
190
Last 10 Years
2017-2026

Recent Year Trend

2021
2022
2023
2024
2025
2026Latest year
202129 max PYQs/year2026

Question Types

190PYQs
MCQ70%
INTEGER30%

Difficulty Mix

#1 Easy116
#2 Medium72
#3 Hard2
125 in last 5 years190 in last 10 years

Last 10 Years Structure of Atom Questions

Showing 50 of 190 filtered questions.

1Structure Of Atom
Consider two radiations of wavelengths

$\lambda_1=2000\mathop {\rm{A}}\limits^{\rm{o}}$
$\lambda_2=6000 \mathop {\rm{A}}\limits^{\rm{o}}$

The ratio of the energies of these two radiations $\left(\frac{E_1}{E_2}\right)$ is $\_\_\_\_$ (Near...
INTEGER+4 / -12026
2Structure Of Atom
\(\text { Match the LIST-I with LIST-II }\)


.tg {border-collapse:collapse;border-spacing:0;}

.tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px;

overflow:hidden;padding:10px 5...
MCQ+4 / -12026
3Structure Of Atom
If shortest wavelength of hydrogen atom in Lyman series is $x$, then longest wavelength in Balmer series of $\mathrm{He}^{+}$is:
MCQ+4 / -12026
4Structure Of Atom
The Bohr radius of a hydrogen like species is 70.53 pm . The species and the stationary state (n) are respectively
(Given : Hydrogen atom Bohr radius is 52.9 pm )
MCQ+4 / -12026
5Structure Of Atom
Arrange the following atomic orbitals of multi electron atoms in order of increasing energy.
A. $n=3, l=2, m=+1$
B. $n=4, l=0, m=0$
C. $n=6, l=1, m=0$
D. $n=5, l=1, m=+1$
E. $n=2, l=1, m=+1$
Choose the correct answer from the options given ...
MCQ+4 / -12026
6Structure Of Atom
Identify the correct statements from the following :
A. Heisenberg uncertainty principle is applicable to electrons.
B. The size of $2 p_x$ orbital is less than the size of $3 p_x$ orbital.
C. The energy of 2 s orbital of H atom is equal to...
MCQ+4 / -12026
7Structure Of Atom
Which of the following statement(s) is/are true ?
A. If two orbitals have the same value of ( $\mathrm{n}+l$ ), the orbital with lower value of n will have lower energy.
B. Energies of the orbitals in the same subshell increase with increas...
MCQ+4 / -12026
8Structure Of Atom
What is the ratio of wave number of first line (lowest energy line) of Balmer series of H atomic spectrum to first line of its Brackett series?
MCQ+4 / -12026
9Structure Of Atom
Which of the following is correct set of 4 quantum numbers of $19^{\text {th }}$ electron in Chromium (Atomic number $=24$ ) in accordance with Aufbau principle?
MCQ+4 / -12026
10Structure Of Atom
The species having identical radii according to the Bohr's theory are :
A. H (first orbit)
B. $\mathrm{He}^{+}$(first orbit)
C. $\mathrm{He}^{+}$(Second orbit)
D. $\mathrm{Li}^{2+}$ (first orbit)
E. $\mathrm{Be}^{3+}$ (Second orbit)
Choose ...
MCQ+4 / -12026
11Structure Of Atom
What is the energy (in J atom−1) required for the following process? Li2+ (g) → Li3+ (g) + e− (Take the ionization energy for the H atom in the ground state as $2.18 \times 10^{−18} \text{ J atom}^{−1}$)
MCQ+4 / -12026
12Structure Of Atom
The surface of sodium metal is irradiated with radiation of wavelength $x$ nm. The kinetic energy of ejected electrons is $2.8 \times 10^{-20}\ \text{J}$. The work function of sodium is $2.3$ eV. The value of $x$ is ________ $\times 10^2$ n...
INTEGER+4 / -12026
13Structure Of Atom
The wave numbers of three spectral lines of H atom are considered. Identify the set of spectral lines belonging to Balmer series.
( $\mathrm{R}=$ Rydberg constant)
MCQ+4 / -12026
14Structure Of Atom

Figure 1. electron probability density for 2 s orbital

Figure 2. wave function for 2s orbital
Which of the following point in Figure 2 most accurately represents the nodal surface as shown in Figure 1?
MCQ+4 / -12026
15Structure Of Atom
Two positively charged particles $m_1$ and $m_2$ have been accelerated across the same potential difference of 200 keV as shown below.[Given mass of $m_1 = 1$ amu and $m_2 = 4$ amu]The deBroglie wavelength of $m_1$ will be $x$ times of $m_2...
INTEGER+4 / -12026
16Structure Of Atom
The wavelength of photon 'A' is 400 nm. The frequency of photon 'B' is $10^{16} \ \text{s}^{-1}$. The wave number of photon 'C' is $10^4 \ \text{cm}^{-1}$. The correct order of energy of these photons is :
MCQ+4 / -12026
17Structure Of Atom
The hydrogen spectrum consists of several spectral lines in Lyman series $\left(L_1, L_2\right.$, $\mathrm{L}_3 \ldots ; \mathrm{L}_1$ has lowest energy among Lyman series). Similarly it consists of several spectral lines in Balmer series $...
INTEGER+4 / -12026
18Structure Of Atom
The wavelength of spectral line obtained in the spectrum of $\mathrm{Li}^{2+}$ ion, when the transition takes place between two levels whose sum is 4 and difference is 2 , is
MCQ+4 / -12026
19Structure Of Atom
Which of the following statements regarding the energy of the stationary state is true in the following one - electron systems ?
MCQ+4 / -12026
20Structure Of Atom
Given,
(A) $\mathrm{n}=5, \mathrm{~m}_1=-1$
(B) $\mathrm{n}=3, \mathrm{l}=2, \mathrm{~m}_1=-1, \mathrm{~m}_{\mathrm{s}}=+\frac{1}{2}$
The maximum number of electron(s) in an atom that can have the quantum numbers as given in (A) and (B) res...
MCQ+4 / -12026
21Structure Of Atom
Identify the INCORRECT statements from the following :
A. Notation ${ }_{12}^{24} \mathrm{Mg}$ represents 24 protons and 12 neutrons.
B. Wavelength of a radiation of frequency $4.5 \times 10^{15} \mathrm{~s}^{-1}$ is $6.7 \times 10^{-8} \ma...
MCQ+4 / -12026
22Structure Of Atom
The work functions of two metals $\left(\mathrm{M}_{\mathrm{A}}\right.$ and $\left.\mathrm{M}_{\mathrm{B}}\right)$ are in the $1: 2$ ratio. When these metals are exposed to photons of energy 6 eV , the kinetic energy of liberated electrons ...
MCQ+4 / -12026
23Structure Of Atom
The energy required by electrons, present in the first Bohr orbit of hydrogen atom to be excited to second Bohr orbit is $\_\_\_\_$ $\mathrm{J} \mathrm{mol}^{-1}$.
Given: $R_H=2.18 \times 10^{-11} \mathrm{ergs}$.
MCQ+4 / -12026
24Structure Of Atom
The energy of first (lowest) Balmer line of H atom is $x \mathrm{~J}$. The energy (in J) of second Balmer line of H atom is :
MCQ+4 / -12026
25Structure Of Atom
Given below are two statements :
Statement I : When an electric discharge is passed through gaseous hydrogen, the hydrogen molecules dissociate and the energetically excited hydrogen atoms produce electromagnetic radiation of discrete frequ...
MCQ+4 / -12026
26Structure Of Atom
Consider the following spectral lines for atomic hydrogen :
A. First line of Paschen series
B. Second line of Balmer series
C. Third line of Paschen series
D. Fourth line of Bracket series
The correct arrangement of the above lines in ascen...
MCQ+4 / -12026
27Structure Of Atom
The energy of an electron in the first Bohr orbit of the H-atom is -13.6 eV. The magnitude of energy value of an electron in the first excited state of Be3+ is ________ eV (nearest integer value).
INTEGER+4 / -12025
28Structure Of Atom
Correct statements for an element with atomic number 9 are:A. There can be 5 electrons for which $m_s = +\frac{1}{2}$ and 4 electrons for which $m_s = -\frac{1}{2}$.B. There is only one electron in $p_z$ orbital.C. The last electron goes to...
MCQ+4 / -12025
29Structure Of Atom

Which of the following statements are correct, if the threshold frequency of caesium is $5.16 \times$ $10^{14} \mathrm{~Hz}$ ?
A. When Cs is placed inside a vacuum chamber with an ammeter connected to it and yellow light is focused on Cs ,...
MCQ+4 / -12025
30Structure Of Atom
The extra stability of half-filled subshell is due to :
(A) Symmetrical distribution of electrons
(B) Smaller coulombic repulsion energy
(C) The presence of electrons with the same spin in non-degenerate orbitals
(D) Larger exchange energy
...
MCQ+4 / -12025
31Structure Of Atom
Which one of the following about an electron occupying the 1 s orbital in a hydrogen atom is incorrect?
(Bohr's radius is represented by $\mathrm{a}_0$)
MCQ+4 / -12025
32Structure Of Atom
Consider the ground state of chromium atom $(Z=24)$. How many electrons are with Azimuthal quantum number $l=1$ and $l=2$ respectively ?
MCQ+4 / -12025
33Structure Of Atom
Which of the following postulate of Bohr's model of hydrogen atom is not in agreement with quantum mechanical model of an atom?
MCQ+4 / -12025
34Structure Of Atom
For electrons in ' 2 s ' and ' 2 p ' orbitals, the orbital angular momentum values, respectively are:
MCQ+4 / -12025
35Structure Of Atom
According to Bohr's model of hydrogen atom, which of the following statement is incorrect?
MCQ+4 / -12025
36Structure Of Atom
Which of the following statements are true?
(A) The subsidiary quantum number $l$ describes the shape of the orbital occupied by the electron.
(B) is the boundary surface diagram of the $2 \mathrm{p}_x$ orbital.
(C) The + and - signs in th...
MCQ+4 / -12025
37Structure Of Atom
If $a$0 is denoted as the Bohr radius of hydrogen atom, then what is the de-Broglie wavelength (λ) of the electron present in the second orbit of hydrogen atom? [n : any integer]
MCQ+4 / -12025
38Structure Of Atom
Given below are two statements :
Statement (I): It is impossible to specify simultaneously with arbitrary precision, both the linear momentum and the position of a particle.
Statement (II) : If the uncertainty in the measurement of position...
MCQ+4 / -12025
39Structure Of Atom
For hydrogen like species, which of the following graphs provides the most appropriate representation of E vs Z plot for a constant n?
[E : Energy of the stationary state, Z : atomic number, n = principal quantum number]
MCQ+4 / -12025
40Structure Of Atom
In a multielectron atom, which of the following orbitals described by three quantum numbers will have same energy in absence of electric and magnetic fields?
A. $\mathrm{n}=1, \mathrm{l}=0, \mathrm{~m}_1=0$
B. $\mathrm{n}=2, \mathrm{l}=0, \...
MCQ+4 / -12025
41Structure Of Atom
Which of the following is/are not correct with respect to energy of atomic orbitals of hydrogen atom?(A) 1s < 2p < 3d < 4s(B) 1s < 2s = 2p < 3s = 3p(C) 1s < 2s < 2p < 3s < 3p(D) 1s < 2s < 4s < 3dChoose the correct answer from the options gi...
MCQ+4 / -12025
42Structure Of Atom
For hydrogen atom, the orbital/s with lowest energy is/are :
(A) $\mathrm{4 s}$
(B) $3 \mathrm{p}_x$
(C) $3 \mathrm{~d}_{x^2-y^2}$
(D) $3 \mathrm{~d}_{z^2}$
(E) $4 \mathrm{p}_z$
Choose the correct answer from the options given below :
MCQ+4 / -12025
43Structure Of Atom
Heat treatment of muscular pain involves radiation of wavelength of about 900 nm . Which spectral line of H atom is suitable for this?
Given : Rydberg constant $\left.\mathrm{R}_{\mathrm{H}}=10^5 \mathrm{~cm}^{-1}, \mathrm{~h}=6.6 \times 10...
MCQ+4 / -12025
44Structure Of Atom
Given below are two statements about X-ray spectra of elements :
Statement (I) : A plot of $\sqrt{v}$ ( $v=$ frequency of X-rays emitted) vs atomic mass is a straight line.
Statement (II) : A plot of $v(\nu=$ frequency of $X$-rays emitted) ...
MCQ+4 / -12025
45Structure Of Atom
Given below are two statements :
Statement (I) : For a given shell, the total number of allowed orbitals is given by $n^2$.
Statement (II) : For any subshell, the spatial orientation of the orbitals is given by $-l$ to $+l$ values including...
MCQ+4 / -12025
46Structure Of Atom
Radius of the first excited state of Helium ion is given as : $\mathrm{a}_0 \rightarrow$ radius of first stationary state of hydrogen atom.
MCQ+4 / -12025
47Structure Of Atom
Given below are two statements :
Statement (I) : A spectral line will be observed for a $2 p_x \rightarrow 2 p_y$ transition.
Statement (II) : $2 \mathrm{p}_x$ and $2 \mathrm{p}_y$ are degenerate orbitals.
In the light of the above statemen...
MCQ+4 / -12025
48Structure Of Atom
Compare the energies of following sets of quantum numbers for multielectron system.
(A) \(\mathrm{n}=4,1=1\)
(B) \(\mathrm{n}=4,1=2\)
(C) \(\mathrm{n}=3, \mathrm{l}=1\)
(D) \(\mathrm{n}=3,1=2\)
(E) \(\mathrm{n}=4,1=0\)
Choose the correct an...
MCQ+4 / -12024
49Structure Of Atom
Based on Heisenberg's uncertainty principle, the uncertainty in the velocity of the electron to be found within an atomic nucleus of diameter \(10^{-15} \mathrm{~m}\) is ________ \(\times 10^9 \mathrm{~ms}^{-1}\) (nearest integer)
[Given : ...
INTEGER+4 / -12024
50Structure Of Atom
The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency '\(A\)' \(\times 10^{12}\) hertz and that has a radiant intensity in that direction of \(\frac{1}{{ 'B'}}\), watt per s...
MCQ+4 / -12024